linux-kernel - Re: PostgreSQL pgbench performance regression in 2.6.23+

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Date:	Thu, 22 May 2008 13:25:53 +0200
From:	Mike Galbraith <efault@....de>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Greg Smith <gsmith@...gsmith.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: PostgreSQL pgbench performance regression in 2.6.23+


On Thu, 2008-05-22 at 12:34 +0200, Mike Galbraith wrote:

> (Nadia's ipc/idr patches are applied though, to see if the high end
> improves over previous runs with various kernels, and it does seem to.)

Disregard the above, no they don't.  (now removed again)

However.  The problem with 2.6.26.git running this testcase appears to
be SYNC_WAKEUPS. No taskset, nada except echo 863 > sched_features
 
2.6.26.git
1 8173.538610
2 15738.206889
3 23399.356839
4 21401.182501
5 21682.839897
6 26396.301413
8 29910.334798
10 29953.625797
15 29535.740343
20 28950.900431
30 27159.733949
40 24163.344207
50 23258.496794

vs

2.6.22.17-0.1-default (opensuse 10.3 stock kernel)
1 7693.501369
2 15669.304960
3 25340.818410
4 24445.932930
5 22807.019544
6 24051.387364
8 22406.392813
10 22631.510576
15 21225.243584
20 20382.232075
30 18834.814588
40 17799.906622
50 17305.274561

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