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Re: [Qemu-devel] QEMU RX offload issues with net device frontend that do
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [Qemu-devel] QEMU RX offload issues with net device frontend that does not support virtio extensions |
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Date: |
Thu, 8 Mar 2012 10:10:15 +0000 |
On Wed, Mar 7, 2012 at 4:32 PM, Dmitry Fleytman
<address@hidden> wrote:
> It looks like there is a problem in QEMU related to usage of frontends
> without virtio extensions.
>
> Normally on RX path QEMU receives packet metadata with offloads
> information in virtio header.
Have you tried -netdev tap,vnet_hdr=off ?
I guess the tricky thing is negotiating whether or not to enable the
host IFF_VNET_HDR flag. (Especially with the QEMU "vlan" feature
where the tap isn't peered directly with another device.)
Stefan