linux-kernel - Re: change in sched cpu_power causing regressions with SCHED

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Date:	Sat, 13 Feb 2010 10:49:40 -0800
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"svaidy@...ux.vnet.ibm.com" <svaidy@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Ma, Ling" <ling.ma@...el.com>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	"ego@...ibm.com" <ego@...ibm.com>
Subject: Re: change in sched cpu_power causing regressions with SCHED_MC

On Sat, 2010-02-13 at 10:37 -0800, Vaidyanathan Srinivasan wrote:
> * Peter Zijlstra <peterz@...radead.org> [2010-02-13 11:42:04]:
> > BTW, do you think its possible to automate such test cases and put them
> > in a test-suite?
> 
> Linux Test Project (LTP) has some test cases for sched_mc/smt
> balancing. 

It is very unfortunate that neither this nor Linux-kernel performance
tests that Yanmin and co tracks has caught these problems much before.
Ling Ma's focused tests/analysis for something else started showing
these basic issues.

> They can be improved and generalized to include all basic
> scheduler task placement checks.  

Probably it is best if we can include the very basic checks/tests in the
kernel itself. More focused and extensive tests can be done outside the
kernel.

thanks,
suresh

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