Re: [net-next RFC V4 PATCH 0/4] Multiqueue virtio-net

[John Fastabend]

On 6/25/2012 3:07 AM, Michael S. Tsirkin wrote:
> On Mon, Jun 25, 2012 at 05:16:48PM +0800, Jason Wang wrote:
> > Hello All:
> >
> > This series is an update version of multiqueue virtio-net driver based on
> > Krishna Kumar's work to let virtio-net use multiple rx/tx queues to do the
> > packets reception and transmission. Please review and comments.
> >
> > Test Environment:
> > - Intel(R) Xeon(R) CPU E5620 @ 2.40GHz, 8 cores 2 numa nodes
> > - Two directed connected 82599
> >
> > Test Summary:
> >
> > - Highlights: huge improvements on TCP_RR test
> > - Lowlights: regression on small packet transmission, higher cpu utilization
> >               than single queue, need further optimization
>
> Didn't review yet, reacting this this paragraph:
>
> To avoid regressions, it seems reasonable to make
> the device use a single queue by default for now.
> Add a way to switch multiqueue on/off using ethtool.
>
> This way guest admin can tune the device for the
> workload manually until we manage to imlement some
> self-tuning heuristics.

Ethtool already has this switch 'ethtool -L' can be
used to set the number tx/rx channels. So you would
likely just need to add a set_channels hook.

.John
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