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

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Message-ID: <alpine.LFD.2.00.0811171134480.18283@nehalem.linux-foundation.org>
Date:	Mon, 17 Nov 2008 11:47:24 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
cc:	mingo@...e.hu, dada1@...mosbay.com, rjw@...k.pl,
	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	cl@...ux-foundation.org, efault@....de, a.p.zijlstra@...llo.nl
Subject: Re: [Bug #11308] tbench regression on each kernel release from 2.6.22
 -&gt; 2.6.28



On Mon, 17 Nov 2008, David Miller wrote:
> 
> The scheduler has accounted for at least %10 of the tbench
> regressions at this point, what are you talking about?

I'm wondering if you're not looking at totally different issues.

For example, if I recall correctly, David had a big hit on the hrtimers. 
And I wonder if perhaps Ingo's numbers are without hrtimers or something? 

The other possibility is that it's just a sparc suckiness issue, that 
simply doesn't show up on x86. 

		Linus
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