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.2.00.0811171149100.18283@nehalem.linux-foundation.org>
Date:	Mon, 17 Nov 2008 11:55:35 -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,
	shemminger@...tta.com
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:
> 
> Again, do a non-NMI profile and the top (at least for me)
> looks like this:

Can _you_ please do a NMI profile and see what your real problem is?

I can't imagine that Niagara (or whatever) is so weak that it can't do 
NMI's. 

The fact is, David, that Ingo just posted a profile that was _better_ than 
anything you have ever posted, and it doesn't show what you complain 
about. So he's not seeing it. Asking him to do a _stupid_ profile is just 
that: stupid.

So try to figure out why his (better) profile doesn't match your 
(inferior) one, instead of asking him to do stupid things. It's some 
difference in architectures, likely: maybe the sparc timekeeping is crap, 
maybe it's a cache issue and sparc caches are crap, maybe it's something 
where Niagara (is it niagara) has some oddness that shows up because it 
has that odd four-threads+four-cores or whatever.

			Linus
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