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Re: [Qemu-devel] virtio: network: lost tcp/ip packets
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] virtio: network: lost tcp/ip packets |
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Date: |
Wed, 30 Aug 2017 18:17:17 +0100 |
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User-agent: |
Mutt/1.8.3 (2017-05-23) |
On Fri, Aug 18, 2017 at 04:40:36PM +0200, Stefan Priebe - Profihost AG wrote:
> i've a problem with two VMs running on the SAME host machine using qemu
> 2.7.1 or 2.9.0 and vhost_net + virtio.
>
> Sometimes TCP packets going from machine a to machine b are simply lost.
> I see them in VM A using tcpdump going out but they never come in on
> machine B. Both machines have iptables and stuff turned off.
>
> On the host both VMs network interfaces are connected to the same bridge.
>
> Any ideas? May be a known bug?
>
> Host and Guest Kernel is an OpenSuSE 42.3 kernel based on vanilla 4.4.82.
Have you tcpdumped the tap interfaces on the host?