esnet
Support sending IMIX traffic pattern
- Version of iperf3 (or development branch, such as
masteror3.1-STABLE) to which this pull request applies:
master
- Issues fixed (if any):
Added support for sending IMIX traffic pattern
- Brief description of code changes (suitable for use as a commit message):
One piece of criticism that iperf3 usually gets is that it is not very realistic. IMIX traffic is fairly standard for load testing middleware and is an important benchmark for various middleware vendors / projects. Since iperf3 is very popular and this change is fairly simple, I thought it'd be a nice addition.
I tested this change by running a server and client locally. And I also attached a bpftrace probe to check that the kernel actually saw the intended distribution of packets.
Regular mode:
$ ./src/iperf3 -c localhost -u -b 0 -4
Connecting to host localhost, port 5201
[ 5] local 127.0.0.1 port 45844 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 4.81 GBytes 41.3 Gbits/sec 157690
[ 5] 1.00-2.00 sec 4.90 GBytes 42.1 Gbits/sec 160510
[ 5] 2.00-3.00 sec 4.89 GBytes 42.0 Gbits/sec 160170
[ 5] 3.00-4.00 sec 4.89 GBytes 42.0 Gbits/sec 160130
[ 5] 4.00-5.00 sec 4.96 GBytes 42.6 Gbits/sec 162520
[ 5] 5.00-6.00 sec 4.95 GBytes 42.5 Gbits/sec 162270
[ 5] 6.00-7.00 sec 4.95 GBytes 42.5 Gbits/sec 162130
[ 5] 7.00-8.00 sec 4.95 GBytes 42.5 Gbits/sec 162170
[ 5] 8.00-9.00 sec 4.95 GBytes 42.5 Gbits/sec 162180
[ 5] 9.00-10.00 sec 4.95 GBytes 42.5 Gbits/sec 162120
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 49.2 GBytes 42.3 Gbits/sec 0.000 ms 0/1611890 (0%) sender
[ 5] 0.00-10.00 sec 49.2 GBytes 42.2 Gbits/sec 0.002 ms 1237/1611890 (0.077%) receiver
iperf Done.
bpftrace output for regular mode:
$ sudo bpftrace -e 'kfunc:udp_rcv { @ = hist(args->skb->len) }'
Attaching 1 probe...
^C
@:
[8, 16) 2 | |
[16, 32) 0 | |
[32, 64) 3 | |
[64, 128) 9 | |
[128, 256) 9 | |
[256, 512) 2 | |
[512, 1K) 0 | |
[1K, 2K) 0 | |
[2K, 4K) 0 | |
[4K, 8K) 0 | |
[8K, 16K) 0 | |
[16K, 32K) 0 | |
[32K, 64K) 1611890 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
IMIX mode:
$ ./src/iperf3 -c localhost -u -4 -b 0 --imix
Connecting to host localhost, port 5201
[ 5] local 127.0.0.1 port 37311 connected to 127.0.0.1 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 134 MBytes 1.13 Gbits/sec 445960
[ 5] 1.00-2.00 sec 140 MBytes 1.17 Gbits/sec 461650
[ 5] 2.00-3.00 sec 139 MBytes 1.16 Gbits/sec 458190
[ 5] 3.00-4.00 sec 134 MBytes 1.13 Gbits/sec 441670
[ 5] 4.00-5.00 sec 135 MBytes 1.13 Gbits/sec 443280
[ 5] 5.00-6.00 sec 136 MBytes 1.14 Gbits/sec 446980
[ 5] 6.00-7.00 sec 138 MBytes 1.16 Gbits/sec 454790
[ 5] 7.00-8.00 sec 138 MBytes 1.16 Gbits/sec 454580
[ 5] 8.00-9.00 sec 135 MBytes 1.13 Gbits/sec 444610
[ 5] 9.00-10.00 sec 141 MBytes 1.18 Gbits/sec 465790
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 1.34 GBytes 1.15 Gbits/sec 0.000 ms 0/4517500 (0%) sender
[ 5] 0.00-10.00 sec 1.34 GBytes 1.15 Gbits/sec 0.001 ms 830/4517500 (0.018%) receiver
iperf Done.
bpftrace output for IMIX mode:
$ sudo bpftrace -e 'kfunc:udp_rcv { @ = hist(args->skb->len) }'
[sudo] password for dxu:
Attaching 1 probe...
^C
@:
[16, 32) 2354059 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
[32, 64) 36 | |
[64, 128) 34 | |
[128, 256) 0 | |
[256, 512) 3 | |
[512, 1K) 1353134 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ |
[1K, 2K) 354144 |@@@@@@@ |
I think there is a bug resulting in packet drops even over loopback. Still debugging. Will update when I figure it out