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Re: [Qemu-devel] [Bug 1556306] Re: vhost-user: qemu stops processing pac

From: Michael S. Tsirkin
Subject: Re: [Qemu-devel] [Bug 1556306] Re: vhost-user: qemu stops processing packets under high load of traffic
Date: Sat, 12 Mar 2016 22:05:00 +0200

On Fri, Mar 11, 2016 at 10:51:33PM -0000, Vincent JARDIN wrote:
> for tracking,
> http://git.qemu.org/?p=qemu.git;a=patch;h=5669655aafdb88a8797c74a989dd0c0ebb1349fa
> -- 
> You received this bug notification because you are a member of qemu-
> devel-ml, which is subscribed to QEMU.
> https://bugs.launchpad.net/bugs/1556306
> Title:
>    vhost-user: qemu stops processing packets under high load of traffic
> Status in QEMU:
>   New

I presume you'll also close this bu at some point?
It's fixed in upstream QEMU.

> Bug description:
>   Description of problem:
>   - qemu socket becomes full, causing qemu to send incomplete
>   SET_VRING_CALL messages to vhost-user backend (without proper fd set in
>   ancillary data).
>   - after some time, some interrupts are lost, causing the VM to stop
>   transmitting packets.
>   How reproducible:
>   Run a stress tests of a vhost-user interface using an UDP
>   traffic generator. Traffic generator (IXIA) was connected to 2 physical 
> ports that are in turn connected to 2 virtio ports through a linux bridge, VM
>   (running linux) doing routing to forward packets between the 2 virtio ports.
>   When traffic reaches high pps rates of small packets,
>   Actual results:
>   - VM stop transmitting packets
>   Expected results:
>   - VM should never stop transmitting packets
>   Additional info:
>   We do propose a fix at:
>     http://lists.nongnu.org/archive/html/qemu-devel/2015-12/msg00652.html
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/qemu/+bug/1556306/+subscriptions

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