Messages in this thread | | | Subject | Re: sysbench+mysql(oltp, readonly) 30% regression with 2.6.26-rc1 | From | Mike Galbraith <> | Date | Thu, 08 May 2008 10:00:17 +0200 |
| |
On Thu, 2008-05-08 at 14:35 +0800, Zhang, Yanmin wrote: > On Wed, 2008-05-07 at 18:26 +0200, Peter Zijlstra wrote: > > On Wed, 2008-05-07 at 12:55 +0800, Zhang, Yanmin wrote: > > > Comparing with kernel 2.6.25, sysbench+mysql(oltp, readonly) has many > > > regression with 2.6.26-rc1. > > > > > > 1) 8-core stoakley: 28%; > > > 2) 16-core tigerton: 20%; > > > 3) Itanium Montvale: 50%. > > > > > > Bisect located below patch. > > > > > > 8f1bc385cfbab474db6c27b5af1e439614f3025c is first bad commit > > > commit 8f1bc385cfbab474db6c27b5af1e439614f3025c > > > Author: Peter Zijlstra <a.p.zijlstra@chello.nl> > > > Date: Sat Apr 19 19:45:00 2008 +0200 > > > > > > sched: fair: weight calculations > > > > > > In order to level the hierarchy, we need to calculate load based on the > > > root view. That is, each task's load is in the same unit. > > > > > > > > > > > > After I manually reverted the patch against 2.6.26-rc1 while fixing a couple of > > > conflictions/errors, sysbench oltp regression became less than 3% on 8-core > > > stoakley. > > > > Does this patch help? > With the patch, oltp testing result is about 50% worse than the one of pure > 2.6.26-rc1.
Hm. I was doing some sysbench+postgress(oltp, ro) testing on my little Q6600 box this morning, and saw a different picture.
In attached pdf, .bkl refers to Linus' BKL patch, .weight is the weight fix, both are applied to git.today. The script I used is also attached.
-Mike [unhandled content-type:application/pdf][unhandled content-type:application/x-shellscript]
| |