linux-kernel - Re: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

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Message-Id: <20081117.112157.146825192.davem@davemloft.net>
Date:	Mon, 17 Nov 2008 11:21:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mingo@...e.hu
Cc:	rjw@...k.pl, linux-kernel@...r.kernel.org,
	kernel-testers@...r.kernel.org, cl@...ux-foundation.org,
	efault@....de, a.p.zijlstra@...llo.nl,
	torvalds@...ux-foundation.org
Subject: Re: [Bug #11308] tbench regression on each kernel release from
 2.6.22 -&gt; 2.6.28

From: Ingo Molnar <mingo@...e.hu>
Date: Mon, 17 Nov 2008 12:01:19 +0100

> The scheduler's overhead barely even registers on a 16-way x86 system 
> i'm running tbench on. Here's the NMI profile during 64 threads tbench 
> on a 16-way x86 box with an v2.6.28-rc5 kernel [config attached]:

Try a non-NMI profile.

It's the whole of the try_to_wake_up() path that's the problem.
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