netdev - [PERF RESULTS] virtio and vhost-net performance enhancements

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Date:	Thu, 26 May 2011 21:02:11 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Christian Borntraeger <borntraeger@...ibm.com>,
	Carsten Otte <cotte@...ibm.com>, habanero@...ux.vnet.ibm.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	kvm@...r.kernel.org, lguest@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux390@...ibm.com, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>, steved@...ibm.com,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>,
	virtualization@...ts.linux-foundation.org,
	Shirley Ma <xma@...ibm.com>
Subject: [PERF RESULTS] virtio and vhost-net performance enhancements

"Michael S. Tsirkin" <mst@...hat.com> wrote on 05/20/2011 04:40:07 AM:

> OK, here is the large patchset that implements the virtio spec update
> that I sent earlier (the spec itself needs a minor update, will send
> that out too next week, but I think we are on the same page here
> already). It supercedes the PUBLISH_USED_IDX patches I sent
> out earlier.

I was able to get this tested by applying the v2 patches
to git-next tree (somehow MST's git tree hung on my guest
which never got resolved). Testing was from Guest -> Remote
node, using an ixgbe 10g card. The test results are
*excellent* (table: #netperf sesssions, BW% improvement,
SD% improvement, CPU% improvement):

___________________________________
           512 byte I/O
#     BW%     SD%      CPU%
____________________________________
1     151.6   -65.1    -10.7
2     180.6   -66.6    -6.4
4     15.5    -35.8    -26.1
8     1.8     -28.4    -26.7
16    3.1     -29.0    -26.5
32    1.1     -27.4    -27.5
64    3.8     -30.9    -26.7
96    5.4     -21.7    -24.2
128   5.7     -24.4    -25.5
____________________________________
BW: 16.6%   SD: -24.6%    CPU: -25.5%


____________________________________
            1K I/O
#     BW%     SD%      CPU%
____________________________________
1     233.9   -76.5    -18.0
2     112.2   -64.0    -23.2
4     9.2     -31.6    -26.1
8    -1.7     -26.8    -30.3
16    3.5     -31.5    -30.6
32    4.8     -25.2    -30.5
64    5.7     -31.0    -28.9
96    5.3     -32.2    -31.7
128   4.6     -38.2    -33.6
____________________________________
BW: 16.4%   SD: -35.%    CPU: -31.5%


____________________________________
             16K I/O
#     BW%     SD%      CPU%
____________________________________
1     18.8    -27.2    -18.3
2     14.8    -36.7    -27.7
4     12.7    -45.2    -38.1
8     4.4     -56.4    -54.4
16    4.8     -38.3    -36.1
32    0        78.0     79.2
64    3.8     -38.1    -37.5
96    7.3     -35.2    -31.1
128   3.4     -31.1    -32.1
____________________________________
BW: 7.6%   SD: -30.1%   CPU: -23.7%


I plan to run some more tests tomorrow. Please let
me know if any other scenario will help.

Thanks,

- KK

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