linux-kernel - Re: volanoMark regression with kernel 2.6.26-rc1

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Message-Id: <1210583090.7402.4.camel@marge.simson.net>
Date:	Mon, 12 May 2008 11:04:50 +0200
From:	Mike Galbraith <efault@....de>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	vatsa@...ux.vnet.ibm.com, Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Aneesh Kumar KV <aneesh.kumar@...ux.vnet.ibm.com>
Subject: Re: volanoMark regression with kernel 2.6.26-rc1


On Mon, 2008-05-12 at 13:02 +0800, Zhang, Yanmin wrote:

> A quick update:
> With 2.6.26-rc2 (CONFIG_USER_SCHED=y), volanoMark result on my 8-core stoakley
> is about 10% worse than the one of 2.6.26-rc1.

Here (Q6600), 2.6.26-rc2 CONFIG_USER_SCHED=y regression culprit for
volanomark is the same one identified for mysql+oltp.

(i have yet to figure out where the buglet lies, but there is definitely
one in there somewhere)

2.6.25.3-smp (baseline, no group scheduling)
test-1.log:Average throughput = 102412 messages per second
test-2.log:Average throughput = 99636 messages per second
test-3.log:Average throughput = 99373 messages per second

CONFIG_CGROUPS=n
CONFIG_USER_SCHED=y

2.6.26-rc2 - 18d95a2832c1392a2d63227a7a6d433cb9f2037e
test-1.log:Average throughput = 102341 messages per second
test-2.log:Average throughput = 101710 messages per second
test-3.log:Average throughput = 100572 messages per second


2.6.26-rc2 + 18d95a2832c1392a2d63227a7a6d433cb9f2037e
test-1.log:Average throughput = 79506 messages per second
test-2.log:Average throughput = 78168 messages per second
test-3.log:Average throughput = 78200 messages per second

CONFIG_CGROUPS=y
CONFIG_USER_SCHED=y

2.6.26-rc2 - 18d95a2832c1392a2d63227a7a6d433cb9f2037e
test-1.log:Average throughput = 103494 messages per second
test-2.log:Average throughput = 100832 messages per second
test-3.log:Average throughput = 98840 messages per second

2.6.26-rc2 + 18d95a2832c1392a2d63227a7a6d433cb9f2037e
test-1.log:Average throughput = 80132 messages per second
test-2.log:Average throughput = 79410 messages per second
test-3.log:Average throughput = 79609 messages per second

CONFIG_CGROUPS=y
CONFIG_CGROUP_SCHED=y

2.6.26-rc2 - 18d95a2832c1392a2d63227a7a6d433cb9f2037e
test-1.log:Average throughput = 103026 messages per second
test-2.log:Average throughput = 101152 messages per second
test-3.log:Average throughput = 102616 messages per second

2.6.26-rc2 + 18d95a2832c1392a2d63227a7a6d433cb9f2037e
test-1.log:Average throughput = 104174 messages per second
test-2.log:Average throughput = 101390 messages per second
test-3.log:Average throughput = 101212 messages per second

(but there are no task groups set up...)


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