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

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Message-ID: <4FE8A4B6.1080200@us.ibm.com>
Date:	Mon, 25 Jun 2012 10:49:42 -0700
From:	Sridhar Samudrala <sri@...ibm.com>
To:	Jason Wang <jasowang@...hat.com>
CC:	krkumar2@...ibm.com, habanero@...ux.vnet.ibm.com,
	rusty@...tcorp.com.au, mst@...hat.com, 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 6/25/2012 2:16 AM, 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
Does this also scale with increased number of VMs?

Thanks
Sridhar
>
> Analysis of the performance result:
>
> - I count the number of packets sending/receiving during the test, and
>    multiqueue show much more ability in terms of packets per second.
>
> - For the tx regression, multiqueue send about 1-2 times of more packets
>    compared to single queue, and the packets size were much smaller than single
>    queue does. I suspect tcp does less batching in multiqueue, so I hack the
>    tcp_write_xmit() to forece more batching, multiqueue works as well as
>    singlequeue for both small transmission and throughput
>
> - I didn't pack the accelerate RFS with virtio-net in this sereis as it still
>    need further shaping, for the one that interested in this please see:
>    http://www.mail-archive.com/kvm@vger.kernel.org/msg64111.html
>
>

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