linux-kernel - Re: High priority tasks break SMP balancer?

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Message-ID: <Pine.LNX.4.64.0711161410490.6633@schroedinger.engr.sgi.com>
Date:	Fri, 16 Nov 2007 14:12:04 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Micah Dowty <micah@...are.com>
cc:	Ingo Molnar <mingo@...e.hu>, Kyle Moffett <mrmacman_g4@....com>,
	Cyrus Massoumi <cyrusm@....net>,
	LKML Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Mike Galbraith <efault@....de>,
	Paul Menage <menage@...gle.com>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Williams <pwil3058@...pond.net.au>
Subject: Re: High priority tasks break SMP balancer?

On Fri, 16 Nov 2007, Micah Dowty wrote:

> 2.6.17 -
> 2.6.19 -
> 2.6.19.7 -
> 2.6.20 +
> 2.6.21 +
> 2.6.22 -
> 2.6.23.1 +
> 
> Here a "-" means that the problem does not occur (my test program uses
> 100% of both CPUs) and a "+" means that the test program leaves one
> CPU mostly idle.
> 
> Unless I've made a mistake, 2.6.22 seems like the outlier rather than
> 2.6.23. Is this inconsistent with the scheduler tick hypothesis?

Siddha fixed an issue with the jiffy accounting in for the softirq 
approach in.22 (vague recall maybe not exactly that version). This may be 
consistent with an issue that was fixed and now surfaces because of 
something else.

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