linux-kernel - Re: [test] hackbench.c interactivity results: vanilla versus SD/RSDL

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Message-Id: <200704031107.22642.kernel@kolivas.org>
Date:	Tue, 3 Apr 2007 11:07:22 +1000
From:	Con Kolivas <kernel@...ivas.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux list <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>
Subject: Re: [test] hackbench.c interactivity results: vanilla versus SD/RSDL

On Thursday 29 March 2007 21:22, Ingo Molnar wrote:
> [ A quick guess: could SD's substandard interactivity in this test be
>   due to the SMP migration logic inconsistencies Mike noticed? This is
>   an SMP system and the hackbench workload is very scheduling intense
>   and tasks are frequently queued from one CPU to another. ]

I assume you put it on and endless loop since hackbench 10 runs for .5 second 
on my machine. Doubtful it's an SMP issue. update_if_moved should maintain 
cross cpu scheduling decisions. The same slowdown would happen on UP and is 
almost certainly due to the fact that hackbench 10 induces a load of _160_ on 
the machine.

-- 
-ck
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