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

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Date:	Tue, 26 Jun 2012 14:02:46 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	Sridhar Samudrala <sri@...ibm.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 06/26/2012 01:49 AM, Sridhar Samudrala wrote:
> 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?
>

Hi Sridhar:

Good suggestions, I didn't measure them. I would run test and post them.

Thanks

> 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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