linux-kernel - Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling

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Message-ID: <OFE36F9C2B.43D9DB04-ON652578AE.0048E1AB-652578AE.004A1462@in.ibm.com>
Date:	Mon, 13 Jun 2011 19:02:27 +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: Re: [PATCHv2 RFC 0/4] virtio and vhost-net capacity handling

"Michael S. Tsirkin" <mst@...hat.com> wrote on 06/07/2011 09:38:30 PM:

> > This is on top of the patches applied by Rusty.
> >
> > Warning: untested. Posting now to give people chance to
> > comment on the API.
>
> OK, this seems to have survived some testing so far,
> after I dropped patch 4 and fixed build for patch 3
> (build fixup patch sent in reply to the original).
>
> I'll be mostly offline until Sunday, would appreciate
> testing reports.

Hi Michael,

I ran the latest patches with 1K I/O (guest->local host) and
the results are (60 sec run for each test case):

______________________________
#sessions   BW%       SD%
______________________________
1           -25.6     47.0
2           -29.3     22.9
4              .8     1.6
8             1.6     0
16          -1.6      4.1
32          -5.3      2.1
48           11.3    -7.8
64          -2.8      .7
96          -6.2      .6
128         -10.6     12.7
______________________________
BW: -4.8     SD: 5.4

I tested it again to see if the regression is fleeting (since
the numbers vary quite a bit for 1K I/O even between guest->
local host), but:

______________________________
#sessions  BW%     SD%
______________________________
1          14.0    -17.3
2          19.9    -11.1
4          7.9     -15.3
8          9.6     -13.1
16         1.2     -7.3
32        -.6      -13.5
48        -28.7     10.0
64        -5.7     -.7
96        -9.4     -8.1
128       -9.4      .7
______________________________
BW: -3.7     SD: -2.0


With 16K, there was an improvement in SD, but
higher sessions seem to slightly degrade BW/SD:

______________________________
#sessions  BW%      SD%
______________________________
1          30.9    -25.0
2          16.5    -19.4
4         -1.3      7.9
8          1.4      6.2
16         3.9     -5.4
32         0        4.3
48        -.5        .1
64         32.1    -1.5
96        -2.1      23.2
128       -7.4      3.8
______________________________
BW: 5.0          SD: 7.5


Thanks,

- KK

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