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kworker hogs CPU only when using WIFI
Describe the bug kworker hogs the CPU only when using WIFI, wired network connections are not affected.
To reproduce This configuration allows a USB peripheral connected to the Pi4 to be controlled by a client running on a remote computer by emulating a USB connection over an IP network.
Install the VirtualHere service named "vhusbdarmpi4", connect SDRPlaydx to USB on the Pi4 and start the client software named "vhui64.exe" on a Windows 10 connected by wire to the same subnet as the Pi4. Note the Pi4 communicates to a router using WIFI and the Win10 computer is connected to the same router but with a wired connection. Using the client software connect remotely to the SDRPlaydx. Note the VirtualHere software uses a USBIP protocol to make it appear that the SDRPlaydx is connected directly to the client via wired USB. On the client start the application "SDRuno". SDRuno is an application that controlls the SDRPlaydx.
Expected behaviour I expect that the configuration to work as well when the Pi4 communicates over WIFI as it does when using a wired connection.
Actual behaviour When the Pi4 uses a WIFI connection a kworker hogs the CPU and lowers the performance of the communications.
System System Information
Raspberry Pi 4 Model B Rev 1.1 PRETTY_NAME="Raspbian GNU/Linux 10 (buster)" NAME="Raspbian GNU/Linux" VERSION_ID="10" VERSION="10 (buster)"
Raspberry Pi reference 2021-01-26 Generated using pi-gen, https://github.com/RPi-Distro/pi-gen, ddba443b028e3673570b52d2fbf471da0341afd4, stage3
Linux playground 5.10.16-v7l+ #1402 SMP Tue Feb 16 14:12:18 GMT 2021 armv7l GNU/Linux Revision : c03111 Serial : 10000000d9860c20 Model : Raspberry Pi 4 Model B Rev 1.1 Throttled flag : throttled=0x0 Camera : supported=0 detected=0
Videocore information
Feb 16 2021 14:17:31 Copyright (c) 2012 Broadcom version d6d82cf99bcb3e9a166a34cfde53130957a36bd3 (clean) (release) (start)
alloc failures: 0 compactions: 0 legacy block fails: 0
Filesystem information
Filesystem 1K-blocks Used Available Use% Mounted on /dev/root 30456660 2676036 26504584 10% / devtmpfs 1827468 0 1827468 0% /dev tmpfs 1959564 16 1959548 1% /dev/shm tmpfs 1959564 8708 1950856 1% /run tmpfs 5120 4 5116 1% /run/lock tmpfs 1959564 0 1959564 0% /sys/fs/cgroup tmpfs 65536 0 65536 0% /tmp/openwebrx /dev/mmcblk0p1 258095 49864 208232 20% /boot tmpfs 391912 0 391912 0% /run/user/1000
Filename Type Size Used Priority /var/swap file 102396 0 -2
Package version information
raspberrypi-ui-mods: Installed: (none) raspberrypi-sys-mods: Installed: 20210208 openbox: Installed: (none) lxpanel: Installed: (none) pcmanfm: Installed: (none) rpd-plym-splash: Installed: (none)
Networking Information
eth0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether m.m.m.m txqueuelen 1000 (Ethernet) RX packets 3641 bytes 560693 (547.5 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3454 bytes 489750 (478.2 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet x.x.x.x netmask x.x.x.x
inet6 ::1 prefixlen 128 scopeid 0x10
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet x.x.x.x netmask x.x.x.x broadcast x.x.x.x inet6 y::y.y.y.y prefixlen 64 scopeid 0x20 ether m.m.m.m txqueuelen 1000 (Ethernet) RX packets 8352567 bytes 393262742 (375.0 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 17850755 bytes 1601157876 (1.4 GiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
USB Information
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/1p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M |__ Port 1: Dev 6, If 0, Class=Vendor Specific Class, Driver=usbfs, 480M |__ Port 2: Dev 4, If 0, Class=Vendor Specific Class, Driver=, 480M |__ Port 3: Dev 5, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 5, If 1, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 3: Dev 5, If 2, Class=Human Interface Device, Driver=usbhid, 12M
config.txt
arm_freq=1500 audio_pwm_mode=514 config_hdmi_boost=5 core_freq=500 core_freq_min=200 disable_commandline_tags=2 disable_l2cache=1 display_hdmi_rotate=-1 display_lcd_rotate=-1 dvfs=2 enable_gic=1 force_eeprom_read=1 force_pwm_open=1 framebuffer_ignore_alpha=1 framebuffer_swap=1 gpu_freq=500 gpu_freq_min=250 init_uart_clock=0x2dc6c00 lcd_framerate=60 mask_gpu_interrupt0=1024 mask_gpu_interrupt1=0x10000 max_framebuffers=2 over_voltage_avs=-17500 pause_burst_frames=1 program_serial_random=1 total_mem=4096 hdmi_force_cec_address:0=65535 hdmi_force_cec_address:1=65535 hdmi_pixel_freq_limit:0=0x11e1a300 hdmi_pixel_freq_limit:1=0x11e1a300 device_tree=- overlay_prefix=overlays/ hdmi_cvt:0= hdmi_cvt:1= hdmi_edid_filename:0= hdmi_edid_filename:1= hdmi_timings:0= hdmi_timings:1=
cmdline.txt
coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M@60,margin_left=48,margin_right=48,margin_top=48,margin_bottom=48 smsc95xx.macaddr=DC:A6:32:25:EB:2D vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 root=PARTUUID=d57429e7-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
raspi-gpio settings
BANK0 (GPIO 0 to 27): GPIO 0: level=1 fsel=0 func=INPUT pull=UP GPIO 1: level=1 fsel=0 func=INPUT pull=UP GPIO 2: level=1 fsel=0 func=INPUT pull=UP GPIO 3: level=1 fsel=0 func=INPUT pull=UP GPIO 4: level=1 fsel=0 func=INPUT pull=UP GPIO 5: level=1 fsel=0 func=INPUT pull=UP GPIO 6: level=1 fsel=0 func=INPUT pull=UP GPIO 7: level=1 fsel=0 func=INPUT pull=UP GPIO 8: level=1 fsel=0 func=INPUT pull=UP GPIO 9: level=0 fsel=0 func=INPUT pull=DOWN GPIO 10: level=0 fsel=0 func=INPUT pull=DOWN GPIO 11: level=0 fsel=0 func=INPUT pull=DOWN GPIO 12: level=0 fsel=0 func=INPUT pull=DOWN GPIO 13: level=0 fsel=0 func=INPUT pull=DOWN GPIO 14: level=1 fsel=0 func=INPUT pull=NONE GPIO 15: level=1 fsel=0 func=INPUT pull=UP GPIO 16: level=0 fsel=0 func=INPUT pull=DOWN GPIO 17: level=0 fsel=0 func=INPUT pull=DOWN GPIO 18: level=0 fsel=0 func=INPUT pull=DOWN GPIO 19: level=0 fsel=0 func=INPUT pull=DOWN GPIO 20: level=0 fsel=0 func=INPUT pull=DOWN GPIO 21: level=0 fsel=0 func=INPUT pull=DOWN GPIO 22: level=0 fsel=0 func=INPUT pull=DOWN GPIO 23: level=0 fsel=0 func=INPUT pull=DOWN GPIO 24: level=0 fsel=0 func=INPUT pull=DOWN GPIO 25: level=0 fsel=0 func=INPUT pull=DOWN GPIO 26: level=0 fsel=0 func=INPUT pull=DOWN GPIO 27: level=0 fsel=0 func=INPUT pull=DOWN BANK1 (GPIO 28 to 45): GPIO 28: level=1 fsel=2 alt=5 func=RGMII_MDIO pull=UP GPIO 29: level=0 fsel=2 alt=5 func=RGMII_MDC pull=DOWN GPIO 30: level=0 fsel=7 alt=3 func=CTS0 pull=UP GPIO 31: level=0 fsel=7 alt=3 func=RTS0 pull=NONE GPIO 32: level=1 fsel=7 alt=3 func=TXD0 pull=NONE GPIO 33: level=1 fsel=7 alt=3 func=RXD0 pull=UP GPIO 34: level=1 fsel=7 alt=3 func=SD1_CLK pull=NONE GPIO 35: level=1 fsel=7 alt=3 func=SD1_CMD pull=UP GPIO 36: level=1 fsel=7 alt=3 func=SD1_DAT0 pull=UP GPIO 37: level=1 fsel=7 alt=3 func=SD1_DAT1 pull=UP GPIO 38: level=1 fsel=7 alt=3 func=SD1_DAT2 pull=UP GPIO 39: level=1 fsel=7 alt=3 func=SD1_DAT3 pull=UP GPIO 40: level=0 fsel=4 alt=0 func=PWM1_0 pull=NONE GPIO 41: level=0 fsel=4 alt=0 func=PWM1_1 pull=NONE GPIO 42: level=0 fsel=1 func=OUTPUT pull=UP GPIO 43: level=1 fsel=0 func=INPUT pull=UP GPIO 44: level=1 fsel=0 func=INPUT pull=UP GPIO 45: level=1 fsel=0 func=INPUT pull=UP BANK2 (GPIO 46 to 53): GPIO 46: level=0 fsel=0 func=INPUT pull=UP GPIO 47: level=0 fsel=0 func=INPUT pull=UP GPIO 48: level=0 fsel=0 func=INPUT pull=DOWN GPIO 49: level=0 fsel=0 func=INPUT pull=DOWN GPIO 50: level=0 fsel=0 func=INPUT pull=DOWN GPIO 51: level=0 fsel=0 func=INPUT pull=DOWN GPIO 52: level=0 fsel=0 func=INPUT pull=DOWN GPIO 53: level=0 fsel=0 func=INPUT pull=DOWN
vcdbg log messages
005413.756: arasan: arasan_emmc_open 005564.380: brfs: File read: /mfs/sd/config.txt 005565.190: brfs: File read: 1809 bytes 005658.925: brfs: File read: /mfs/sd/config.txt 005675.239: brfs: File read: 1809 bytes 006154.825: gpioman: gpioman_get_pin_num: pin DISPLAY_DSI_PORT not defined 006157.322: *** Restart logging 006161.249: hdmi: HDMI:hdmi_get_state is deprecated, use hdmi_get_display_state instead 006198.045: HDMI0: hdmi_pixel_encoding: 300000000 006198.057: HDMI1: hdmi_pixel_encoding: 300000000 006203.003: dtb_file 'bcm2711-rpi-4-b.dtb' 006208.733: brfs: File read: /mfs/sd/bcm2711-rpi-4-b.dtb 006208.747: Loading 'bcm2711-rpi-4-b.dtb' to 0x100 size 0xbeee 006221.206: brfs: File read: 48878 bytes 006232.633: brfs: File read: /mfs/sd/overlays/overlay_map.dtb 006296.190: brfs: File read: 1523 bytes 006298.795: brfs: File read: /mfs/sd/config.txt 006299.274: dtparam: audio=on 006309.082: brfs: File read: 1809 bytes 006322.474: brfs: File read: /mfs/sd/overlays/vc4-fkms-v3d.dtbo 006339.447: Loaded overlay 'vc4-fkms-v3d' 006339.491: dtparam: sd_poll_once=on 006408.359: brfs: File read: 1446 bytes 006410.760: brfs: File read: /mfs/sd/cmdline.txt 006410.824: Read command line from file 'cmdline.txt': 006410.848: 'console=serial0,115200 console=tty1 root=PARTUUID=d57429e7-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait' 007618.685: brfs: File read: 121 bytes 008937.091: brfs: File read: /mfs/sd/kernel7l.img 008937.130: Loading 'kernel7l.img' to 0x8000 size 0x65ff38 008937.180: Device tree loaded to 0x2eff3a00 (size 0xc526) 008944.364: gpioman: gpioman_get_pin_num: pin SDCARD_CONTROL_POWER not defined 012451.259: vchiq_core: vchiq_init_state: slot_zero = 0xded80000, is_master = 1 012454.791: hdmi: HDMI:hdmi_get_state is deprecated, use hdmi_get_display_state instead 012462.924: TV service:host side not connected, dropping notification 0x00000002, 0x00000001, 0x00000010 016374.365: TV service:host side not connected, dropping notification 0x00000008, 0x00000004, 0x00000001
dmesg log
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.10.16-v7l+ (dom@buildbot) (arm-linux-gnueabihf-gcc-8 (Ubuntu/Linaro 8.4.0-3ubuntu1) 8.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #1402 SMP Tue Feb 16 14:12:18 GMT 2021
[ 0.000000] CPU: ARMv7 Processor [410fd083] revision 3 (ARMv7), cr=30c5383d
[ 0.000000] CPU: div instructions available: patching division code
[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
[ 0.000000] OF: fdt: Machine model: Raspberry Pi 4 Model B Rev 1.1
[ 0.000000] Memory policy: Data cache writealloc
[ 0.000000] Reserved memory: created CMA memory pool at 0x000000001ec00000, size 256 MiB
[ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000000000000-0x000000002fffffff]
[ 0.000000] Normal empty
[ 0.000000] HighMem [mem 0x0000000030000000-0x00000000fbffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x000000003b3fffff]
[ 0.000000] node 0: [mem 0x0000000040000000-0x00000000fbffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x00000000fbffffff]
[ 0.000000] On node 0 totalpages: 1012736
[ 0.000000] DMA zone: 2304 pages used for memmap
[ 0.000000] DMA zone: 0 pages reserved
[ 0.000000] DMA zone: 196608 pages, LIFO batch:63
[ 0.000000] HighMem zone: 816128 pages, LIFO batch:63
[ 0.000000] percpu: Embedded 20 pages/cpu s50636 r8192 d23092 u81920
[ 0.000000] pcpu-alloc: s50636 r8192 d23092 u81920 alloc=20*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 1010432
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=0 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 video=HDMI-A-1:1920x1080M@60,margin_left=48,margin_right=48,margin_top=48,margin_bottom=48 smsc95xx.macaddr=m.m.m.m vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 console=ttyS0,115200 console=tty1 root=PARTUUID=d57429e7-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
[ 0.000000] Kernel parameter elevator= does not have any effect anymore.
Please use sysfs to set IO scheduler for individual devices.
[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] software IO TLB: mapped [mem 0x0000000017cc0000-0x000000001bcc0000] (64MB)
[ 0.000000] Memory: 3654940K/4050944K available (10240K kernel code, 1358K rwdata, 3156K rodata, 2048K init, 890K bss, 133860K reserved, 262144K cma-reserved, 3264512K highmem)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] ftrace: allocating 33892 entries in 67 pages
[ 0.000000] ftrace: allocated 67 pages with 3 groups
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] Rude variant of Tasks RCU enabled.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] GIC: Using split EOI/Deactivate mode
[ 0.000000] random: get_random_bytes called from start_kernel+0x3c8/0x598 with crng_init=0
[ 0.000009] sched_clock: 32 bits at 1000kHz, resolution 1000ns, wraps every 2147483647500ns
[ 0.000036] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275 ns
[ 0.000104] bcm2835: system timer (irq = 25)
[ 0.000751] arch_timer: cp15 timer(s) running at 54.00MHz (phys).
[ 0.000772] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0xc743ce346, max_idle_ns: 440795203123 ns
[ 0.000794] sched_clock: 56 bits at 54MHz, resolution 18ns, wraps every 4398046511102ns
[ 0.000812] Switching to timer-based delay loop, resolution 18ns
[ 0.001066] Console: colour dummy device 80x30
[ 0.001808] printk: console [tty1] enabled
[ 0.001874] Calibrating delay loop (skipped), value calculated using timer frequency.. 108.00 BogoMIPS (lpj=540000)
[ 0.001928] pid_max: default: 32768 minimum: 301
[ 0.002110] LSM: Security Framework initializing
[ 0.002309] Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[ 0.002355] Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[ 0.003993] Disabling memory control group subsystem
[ 0.004135] CPU: Testing write buffer coherency: ok
[ 0.004628] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.005880] Setting up static identity map for 0x200000 - 0x20003c
[ 0.006100] rcu: Hierarchical SRCU implementation.
[ 0.007079] smp: Bringing up secondary CPUs ...
[ 0.008363] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[ 0.009772] CPU2: thread -1, cpu 2, socket 0, mpidr 80000002
[ 0.011233] CPU3: thread -1, cpu 3, socket 0, mpidr 80000003
[ 0.011391] smp: Brought up 1 node, 4 CPUs
[ 0.011438] SMP: Total of 4 processors activated (432.00 BogoMIPS).
[ 0.011468] CPU: All CPU(s) started in HYP mode.
[ 0.011494] CPU: Virtualization extensions available.
[ 0.012391] devtmpfs: initialized
[ 0.026598] VFP support v0.3: implementor 41 architecture 3 part 40 variant 8 rev 0
[ 0.026870] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.026925] futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
[ 0.034278] pinctrl core: initialized pinctrl subsystem
[ 0.035354] NET: Registered protocol family 16
[ 0.039557] DMA: preallocated 1024 KiB pool for atomic coherent allocations
[ 0.040361] audit: initializing netlink subsys (disabled)
[ 0.040642] audit: type=2000 audit(0.030:1): state=initialized audit_enabled=0 res=1
[ 0.041264] thermal_sys: Registered thermal governor 'step_wise'
[ 0.042003] hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
[ 0.042058] hw-breakpoint: maximum watchpoint size is 8 bytes.
[ 0.042483] Serial: AMBA PL011 UART driver
[ 0.074588] bcm2835-mbox fe00b880.mailbox: mailbox enabled
[ 0.090922] raspberrypi-firmware soc:firmware: Attached to firmware from 2021-02-16T14:17:31, variant start
[ 0.100936] raspberrypi-firmware soc:firmware: Firmware hash is d6d82cf99bcb3e9a166a34cfde53130957a36bd3
[ 0.145505] bcm2835-dma fe007000.dma: DMA legacy API manager, dmachans=0x1
[ 0.149752] vgaarb: loaded
[ 0.150232] SCSI subsystem initialized
[ 0.150478] usbcore: registered new interface driver usbfs
[ 0.150555] usbcore: registered new interface driver hub
[ 0.150641] usbcore: registered new device driver usb
[ 0.151383] usb_phy_generic phy: supply vcc not found, using dummy regulator
[ 0.153343] clocksource: Switched to clocksource arch_sys_counter
[ 1.114354] VFS: Disk quotas dquot_6.6.0
[ 1.114473] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 1.114671] FS-Cache: Loaded
[ 1.114903] CacheFiles: Loaded
[ 1.116002] simple-framebuffer 3e4e0000.framebuffer: framebuffer at 0x3e4e0000, 0x6e7000 bytes, mapped to 0x(ptrval)
[ 1.116047] simple-framebuffer 3e4e0000.framebuffer: format=a8r8g8b8, mode=1824x984x32, linelength=7296
[ 1.125659] Console: switching to colour frame buffer device 228x61
[ 1.134439] simple-framebuffer 3e4e0000.framebuffer: fb0: simplefb registered!
[ 1.145142] NET: Registered protocol family 2
[ 1.146063] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
[ 1.146291] TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear)
[ 1.146435] TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear)
[ 1.146581] TCP: Hash tables configured (established 8192 bind 8192)
[ 1.146823] UDP hash table entries: 512 (order: 2, 16384 bytes, linear)
[ 1.146931] UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear)
[ 1.147276] NET: Registered protocol family 1
[ 1.148066] RPC: Registered named UNIX socket transport module.
[ 1.148147] RPC: Registered udp transport module.
[ 1.148212] RPC: Registered tcp transport module.
[ 1.148276] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 1.148364] PCI: CLS 0 bytes, default 64
[ 1.151405] Initialise system trusted keyrings
[ 1.151706] workingset: timestamp_bits=14 max_order=20 bucket_order=6
[ 1.160482] zbud: loaded
[ 1.162382] FS-Cache: Netfs 'nfs' registered for caching
[ 1.163440] NFS: Registering the id_resolver key type
[ 1.163535] Key type id_resolver registered
[ 1.163598] Key type id_legacy registered
[ 1.163774] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
[ 1.164910] Key type asymmetric registered
[ 1.164976] Asymmetric key parser 'x509' registered
[ 1.165221] bounce: pool size: 64 pages
[ 1.165309] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 249)
[ 1.168152] io scheduler mq-deadline registered
[ 1.170740] io scheduler kyber registered
[ 1.178028] brcm-pcie fd500000.pcie: host bridge /scb/pcie@7d500000 ranges:
[ 1.180719] brcm-pcie fd500000.pcie: No bus range found for /scb/pcie@7d500000, using [bus 00-ff]
[ 1.183532] brcm-pcie fd500000.pcie: MEM 0x0600000000..0x063fffffff -> 0x00c0000000
[ 1.186116] brcm-pcie fd500000.pcie: IB MEM 0x0000000000..0x00bfffffff -> 0x0400000000
[ 1.245448] brcm-pcie fd500000.pcie: link up, 5.0 GT/s PCIe x1 (SSC)
[ 1.248411] brcm-pcie fd500000.pcie: PCI host bridge to bus 0000:00
[ 1.250966] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 1.253511] pci_bus 0000:00: root bus resource [mem 0x600000000-0x63fffffff] (bus address [0xc0000000-0xffffffff])
[ 1.256183] pci 0000:00:00.0: [14e4:2711] type 01 class 0x060400
[ 1.258985] pci 0000:00:00.0: PME# supported from D0 D3hot
[ 1.264991] PCI: bus0: Fast back to back transfers disabled
[ 1.267832] pci 0000:01:00.0: [1106:3483] type 00 class 0x0c0330
[ 1.270391] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00000fff 64bit]
[ 1.273426] pci 0000:01:00.0: PME# supported from D0 D3cold
[ 1.279416] PCI: bus1: Fast back to back transfers disabled
[ 1.282014] pci 0000:00:00.0: BAR 8: assigned [mem 0x600000000-0x6000fffff]
[ 1.284615] pci 0000:01:00.0: BAR 0: assigned [mem 0x600000000-0x600000fff 64bit]
[ 1.287179] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 1.289735] pci 0000:00:00.0: bridge window [mem 0x600000000-0x6000fffff]
[ 1.292690] pcieport 0000:00:00.0: enabling device (0140 -> 0142)
[ 1.295470] pcieport 0000:00:00.0: PME: Signaling with IRQ 62
[ 1.306675] iproc-rng200 fe104000.rng: hwrng registered
[ 1.309554] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[ 1.313036] gpiomem-bcm2835 fe200000.gpiomem: Initialised: Registers at 0xfe200000
[ 1.328101] brd: module loaded
[ 1.343176] loop: module loaded
[ 1.347509] Loading iSCSI transport class v2.0-870.
[ 1.352436] libphy: Fixed MDIO Bus: probed
[ 1.356736] bcmgenet fd580000.ethernet: GENET 5.0 EPHY: 0x0000
[ 1.373412] libphy: bcmgenet MII bus: probed
[ 1.453485] unimac-mdio unimac-mdio.-19: Broadcom UniMAC MDIO bus
[ 1.457132] usbcore: registered new interface driver r8152
[ 1.459639] usbcore: registered new interface driver lan78xx
[ 1.462100] usbcore: registered new interface driver smsc95xx
[ 1.466171] xhci_hcd 0000:01:00.0: enabling device (0140 -> 0142)
[ 1.468603] xhci_hcd 0000:01:00.0: xHCI Host Controller
[ 1.470927] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
[ 1.476712] xhci_hcd 0000:01:00.0: hcc params 0x002841eb hci version 0x100 quirks 0x0000030000000890
[ 1.480452] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.10
[ 1.482906] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.485284] usb usb1: Product: xHCI Host Controller
[ 1.487664] usb usb1: Manufacturer: Linux 5.10.16-v7l+ xhci-hcd
[ 1.490091] usb usb1: SerialNumber: 0000:01:00.0
[ 1.493258] hub 1-0:1.0: USB hub found
[ 1.495768] hub 1-0:1.0: 1 port detected
[ 1.498817] xhci_hcd 0000:01:00.0: xHCI Host Controller
[ 1.501186] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2
[ 1.503537] xhci_hcd 0000:01:00.0: Host supports USB 3.0 SuperSpeed
[ 1.506490] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.10
[ 1.508928] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 1.511357] usb usb2: Product: xHCI Host Controller
[ 1.513798] usb usb2: Manufacturer: Linux 5.10.16-v7l+ xhci-hcd
[ 1.516225] usb usb2: SerialNumber: 0000:01:00.0
[ 1.519225] hub 2-0:1.0: USB hub found
[ 1.521656] hub 2-0:1.0: 4 ports detected
[ 1.525773] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[ 1.528465] dwc_otg: FIQ enabled
[ 1.528480] dwc_otg: NAK holdoff enabled
[ 1.528494] dwc_otg: FIQ split-transaction FSM enabled
[ 1.528513] Module dwc_common_port init
[ 1.528975] usbcore: registered new interface driver uas
[ 1.531434] usbcore: registered new interface driver usb-storage
[ 1.534045] mousedev: PS/2 mouse device common for all mice
[ 1.538024] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[ 1.544061] sdhci: Secure Digital Host Controller Interface driver
[ 1.546475] sdhci: Copyright(c) Pierre Ossman
[ 1.549546] mmc-bcm2835 fe300000.mmcnr: could not get clk, deferring probe
[ 1.552496] sdhci-pltfm: SDHCI platform and OF driver helper
[ 1.559027] ledtrig-cpu: registered to indicate activity on CPUs
[ 1.561748] hid: raw HID events driver (C) Jiri Kosina
[ 1.564330] usbcore: registered new interface driver usbhid
[ 1.566678] usbhid: USB HID core driver
[ 1.574966] Initializing XFRM netlink socket
[ 1.577409] NET: Registered protocol family 17
[ 1.579899] Key type dns_resolver registered
[ 1.582739] Registering SWP/SWPB emulation handler
[ 1.585202] registered taskstats version 1
[ 1.587487] Loading compiled-in X.509 certificates
[ 1.590647] Key type ._fscrypt registered
[ 1.592946] Key type .fscrypt registered
[ 1.595331] Key type fscrypt-provisioning registered
[ 1.609125] uart-pl011 fe201000.serial: there is not valid maps for state default
[ 1.611754] uart-pl011 fe201000.serial: cts_event_workaround enabled
[ 1.614139] fe201000.serial: ttyAMA0 at MMIO 0xfe201000 (irq = 36, base_baud = 0) is a PL011 rev2
[ 1.623570] bcm2835-power bcm2835-power: Broadcom BCM2835 power domains driver
[ 1.627007] mmc-bcm2835 fe300000.mmcnr: mmc_debug:0 mmc_debug2:0
[ 1.629354] mmc-bcm2835 fe300000.mmcnr: DMA channel allocated
[ 1.661090] of_cfs_init
[ 1.663774] of_cfs_init: OK
[ 1.682121] mmc1: queuing unknown CIS tuple 0x80 (2 bytes)
[ 1.686094] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 1.690029] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 1.695293] mmc1: queuing unknown CIS tuple 0x80 (7 bytes)
[ 1.697594] mmc0: SDHCI controller on fe340000.emmc2 [fe340000.emmc2] using ADMA
[ 1.700525] Waiting for root device PARTUUID=d57429e7-02...
[ 1.701776] mmc1: queuing unknown CIS tuple 0x80 (3 bytes)
[ 1.751042] random: fast init done
[ 1.802871] mmc1: new high speed SDIO card at address 0001
[ 1.814375] mmc0: new ultra high speed DDR50 SDHC card at address 0001
[ 1.817532] mmcblk0: mmc0:0001 GB1QT 29.8 GiB
[ 1.821514] mmcblk0: p1 p2
[ 1.860443] EXT4-fs (mmcblk0p2): INFO: recovery required on readonly filesystem
[ 1.862758] EXT4-fs (mmcblk0p2): write access will be enabled during recovery
[ 1.873394] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[ 1.951656] EXT4-fs (mmcblk0p2): recovery complete
[ 1.956710] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 1.959126] VFS: Mounted root (ext4 filesystem) readonly on device 179:2.
[ 1.962353] devtmpfs: mounted
[ 1.973828] Freeing unused kernel memory: 2048K
[ 1.976453] Run /sbin/init as init process
[ 1.978737] with arguments:
[ 1.978752] /sbin/init
[ 1.978766] with environment:
[ 1.978781] HOME=/
[ 1.978795] TERM=linux
[ 2.056397] usb 1-1: New USB device found, idVendor=2109, idProduct=3431, bcdDevice= 4.21
[ 2.058797] usb 1-1: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 2.061192] usb 1-1: Product: USB2.0 Hub
[ 2.065880] hub 1-1:1.0: USB hub found
[ 2.068525] hub 1-1:1.0: 4 ports detected
[ 2.397523] systemd[1]: System time before build time, advancing clock.
[ 2.403396] usb 1-1.1: new high-speed USB device number 3 using xhci_hcd
[ 2.504311] NET: Registered protocol family 10
[ 2.508188] Segment Routing with IPv6
[ 2.544368] usb 1-1.1: New USB device found, idVendor=1df7, idProduct=3030, bcdDevice= 2.00
[ 2.546916] usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[ 2.563305] systemd[1]: systemd 241 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybrid)
[ 2.569802] systemd[1]: Detected architecture arm.
[ 2.653404] usb 1-1.2: new high-speed USB device number 4 using xhci_hcd
[ 2.659863] systemd[1]: Set hostname to
Logs
If applicable, add the relevant output from dmesg or similar.
Additional context I have a PI 4B and am experiencing a kworker that hogs the cpu only when using WIFI. I have updated the kernel to 5.10.16-v7l+ and added "dtparam=sd_poll_once=on" to config.txt. I have verified that "sd_poll_once" is active using "dtc -I fs /proc/device-tree" which shows "sd_poll_once = "\0\0\0?non-removable?";". None of these changes fixed the problem.
Using top the the first two lines are:
1387 root 20 0 0 0 0 I 21.6 0.0 0:16.66 kworker/u8:2-brcmf_wq/mmc1:0001:1
839 root 20 0 6964 2380 4 S 14.0 0.1 0:18.22 vhusbdarmpi4
The offending kworker always shows as "kworker/u8:2-brcmf_wq/mmc1:0001:1" with the number after "/u8:" changing between 2, 3, and 4. Also the number is followed alternately by "+" and "-" (ie: "u8:2+brcmf" and "u8:2-brcmf").
The process "vhusbdarmpi4" is running as a service started by systemd, it is communicating via WIFI and is running a USBIP protocol. If I use a wired connection instead of WIFI the kworker disappears and the service runs as expected.
Thanks,
Steve
Any progress on this? My pi just locked up and I had to hard power cycle it and upon reboot I have the below eating anything from 2-30% CPU:
1476 root 20 0 0 0 0 I 10.6 0.0 0:24.80 kworker/u8:2-brcmf_wq/mmc1:0001:1
I've done the usual apt-get update && upgrade and am on kernel 5.10.23-v7l+
Not as far as I know.
On Apr 12, 2021, at 7:18 AM, cat007mine @.***> wrote:
Any progress on this? My pi just locked up and I had to hard power cycle it and upon reboot I have the below eating anything from 2-30% CPU:
1476 root 20 0 0 0 0 I 10.6 0.0 0:24.80 kworker/u8:2-brcmf_wq/mmc1:0001:1
I've done the usual apt-get update && upgrade and am on kernel 5.10.23-v7l+
— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/raspberrypi/linux/issues/4166#issuecomment-817726022, or unsubscribe https://github.com/notifications/unsubscribe-auth/AB4EQIO4GABETSFKYICTXJDTILJH5ANCNFSM4YA7WBUQ.
@cat007mine:
- What is your software configuration? The closer to a stock RPiOS, the more likely this issue will get looked at.
- How consistently do you see this CPU spin?
I have forgotten some of the details but they might be in my bug report. To the best of my memory, I was using a fully updated RPiOS that had started life as a packaged solution from a third party. I was running a service from a different third party and when I connected over WIFI a kernel worker thread would hog 25% of the CPU, I found this would not happen if I connected to the network via wire. I applied the fix for a similar problem where a kernel worker would hog the CPU by repeatedly checking if the SD card was connected, but this didn't help. I also updated to the beta kernel but this didn't help either. My solution was to stop connecting over WIFI.
Steve
On Apr 12, 2021, at 10:11 AM, Phil Elwell @.***> wrote:
@cat007mine https://github.com/cat007mine:
What is your software configuration? The closer to a stock RPiOS, the more likely this issue will get looked at. How consistently do you see this CPU spin? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/raspberrypi/linux/issues/4166#issuecomment-817845064, or unsubscribe https://github.com/notifications/unsubscribe-auth/AB4EQILDCFIXTMOMB4EPQE3TIL5QPANCNFSM4YA7WBUQ.
dtparam=sd_poll_once only affects the SD card controller (emmc2 on a Pi 4), but both upstream and downstream DTBs already set the non-removable flag for the WiFi SD interface (EMMC/SD1) so poll-once is already enabled.
I have this same issue on LibreELEC 9.95.2 using commit https://github.com/LibreELEC/LibreELEC.tv/tree/0f2dcbea9038df060f47913974111fbc8909f643
Appears to cause NFS read errors (error # -4), and NFS stream stalls. There is also a brief lockup or responsiveness issue when logged in via SSH.
I remove cap-sdio-irq in dts
Can you explain what you did? I don't see cap-sdio-irq in the Raspberry Pi DTS files.
@ssackett you can also check another post, I fixed the issue on my test board by removing WL_HOST_WAKE interrupt in dts.
https://github.com/grate-driver/linux/issues/37
That's in interesting suggestion, but the Pi boards and their DTS files don't use the host-wake feature, so there's nothing to delete.
At leaset, you can check if there are lots of brcmf_oob_intr interrupts recorded in /proc/interrupts on the Pi boards. If yes, then it may be a clue for further investigation on the Pi boards.
There is no brcmf_oob_intr in /proc/interrupts on any Pi because the interrupt line is not connected. Feel free to inspect the DTS file and point it out to me - this is the only WiFi-related node: https://github.com/raspberrypi/linux/blob/rpi-5.15.y/arch/arm/boot/dts/bcm2711-rpi-4-b.dts#L192
Hi.
This problem is still around at least for RPi Zero W2.
RPi Zero W2
All packages are up to date.
I'am transferring files from a windows computer to the RPi Zero W2 over SMB using WIFI on the RPi Zero W2
Transfering files over SMB to a connected SSD drive. ( I got a zero W2 to SSD boards connected)
CPU 47% kworker/u9:0+brcmf_wq/mmc1:0001:1
