Re: volanoMark regression with kernel 2.6.26-rc1

Mike Galbraith
2008-05-12T09:05:07Z

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...)