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

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Message-ID: <20120625100758.GB19169@redhat.com>
Date:	Mon, 25 Jun 2012 13:07:58 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
Cc:	krkumar2@...ibm.com, habanero@...ux.vnet.ibm.com,
	rusty@...tcorp.com.au, netdev@...r.kernel.org, mashirle@...ibm.com,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, edumazet@...gle.com,
	tahm@...ux.vnet.ibm.com, jwhan@...ewood.snu.ac.kr,
	akong@...hat.com, davem@...emloft.net, kvm@...r.kernel.org
Subject: Re: [net-next RFC V4 PATCH 0/4] Multiqueue virtio-net

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
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