Xiaoling_Gao

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I test on qemu-kvm-7.0 and virtio-win-prewhql-221,after installing balloon driver, cpu/memory looks good(see the picture).Anyway I'm installing a RHEL850 host to have a try. ![balloon-mem](https://user-images.githubusercontent.com/9928220/188823544-777e602a-53ef-42b2-b4e9-3c3d6e36f660.png) qemu command line of balloon device....

I can't reproduce on RHEL8.5 yet. VM: Win2k22 qemu-kvm-4.2.0-60.module+el8.5.0+14545 virtio-win-prewhql-0.1-221.iso

Tried with virtio-win-prewhql-0.1-217 on Win10-64(21h2) guest, can upload the photo(you provided) to backblaze from Z:(virtiofs shared volume).Also I tried to uploda/download a 488M size file,it works fine. ![backblaze](https://user-images.githubusercontent.com/9928220/190114668-98a4a605-8698-41f2-be96-ab4ba8359806.png) host info:...

Also I would like to add my host info. kernel: kernel-4.18.0-348.23.1.el8_5.x86_64 qemu-kvm: qemu-kvm-4.2.0-60.module+el8.5.0+14545+9e40c7b1.2.x86_64 virtiofsd: rpm -qf /usr/libexec/virtiofsd qemu-kvm-core-4.2.0-60.module+el8.5.0+14545+9e40c7b1.2.x86_64

For x86, it indeed has a performance decreation compared with linux guest. Ws2022 WRITE: bw=111MiB/s (117MB/s), 891KiB/s-901KiB/s (912kB/s-922kB/s), io=128GiB (137GB), run=1164286-1177315msec READ: bw=122MiB/s (128MB/s), 979KiB/s-1351KiB/s (1003kB/s-1383kB/s), io=128GiB (137GB), run=776408-1070633msec VS...

I was also doing a performance test of virtiofs compared with samba, the result seems that virtiofs performance is better than samba. I created the samba on the host. fio...

(1/4) Host_RHEL.m9.u2.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.Win10.x86_64.io-github-autotest-qemu.unattended_install.cdrom.extra_cdrom_ks.default_install.aio_threads.q35: STARTED (1/4) Host_RHEL.m9.u2.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.Win10.x86_64.io-github-autotest-qemu.unattended_install.cdrom.extra_cdrom_ks.default_install.aio_threads.q35: PASS (1522.44 s) (2/4) Host_RHEL.m9.u2.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.Win10.x86_64.io-github-autotest-qemu.win_virtio_driver_installer_pretest.create_iso.q35: STARTED (2/4) Host_RHEL.m9.u2.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.Win10.x86_64.io-github-autotest-qemu.win_virtio_driver_installer_pretest.create_iso.q35: PASS (591.98 s) (3/4) Host_RHEL.m9.u2.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.Win10.x86_64.io-github-autotest-qemu.win_virtio_driver_installer_pretest.install_uninstall.q35: STARTED (3/4) Host_RHEL.m9.u2.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.Win10.x86_64.io-github-autotest-qemu.win_virtio_driver_installer_pretest.install_uninstall.q35: FAIL: ['VirtIO RNG Device', 'VirtIO Serial Driver', 'VirtIO Balloon...

@leidwang @vivianQizhu Could you help to review? Thanks

@vivianQizhu All your suggestions are updated, thanks.

@kantlivelong Hi, You might parse the arguments from the registry, refer to the wiki https://github.com/virtio-win/kvm-guest-drivers-windows/wiki/Virtiofs:-Shared-file-system#options .