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

From: "Michael S. Tsirkin" <[email-masked]>
Date: Mon, 25 Jun 2012 13:07:58 +0300

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.

-- 
MST