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  1. RHEL
  2. RHEL-19627

netkvm: RX packet loss happens on device side due to slow reuse of memory buffers

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    • virtio-win-prewhql-0.1-253
    • rhel-sst-virtualization-windows
    • ssg_virtualization
    • 11
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    • QE ack
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    • Red Hat Enterprise Linux
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    • Enhancement
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      .Adjustable packet loss prevention added for the NetKVM driver

      This update adds the `MinRxBufferPercent` parameter for the the NetKVM driver, which you can use to reduce the risk of received packet loss in Windows virtual machines. The default value of `MinRxBufferPercent` is 0, and setting a higher value, up to 100, improves the prevention of packet loss, but might increase CPU consumption during high network traffic.
      Show
      .Adjustable packet loss prevention added for the NetKVM driver This update adds the `MinRxBufferPercent` parameter for the the NetKVM driver, which you can use to reduce the risk of received packet loss in Windows virtual machines. The default value of `MinRxBufferPercent` is 0, and setting a higher value, up to 100, improves the prevention of packet loss, but might increase CPU consumption during high network traffic.
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      Under various conditions when packet rate host-to-device is high we loss packets in QEMU due to lack of guest-allocated buffers.

      Look also in https://github.com/virtio-win/kvm-guest-drivers-windows/issues/1012

      Several setups when the problem reproduced are described in the issue and comments.

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              yuri.benditovich Yuri Benditovich
              yuri.benditovich Yuri Benditovich
              Virt Windows SST Bugs Virt Windows SST Bugs
              Wenkang Ji Wenkang Ji
              Jiří Herrmann Jiří Herrmann
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