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

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Message-ID: <20081117195316.GA8235@elte.hu>
Date:	Mon, 17 Nov 2008 20:53:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	David Miller <davem@...emloft.net>, 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

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> 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?

hrtimers should not be an issue anymore since this commit:

| commit 0c4b83da58ec2e96ce9c44c211d6eac5f9dae478
| Author: Ingo Molnar <mingo@...e.hu>
| Date:   Mon Oct 20 14:27:43 2008 +0200
|
|     sched: disable the hrtick for now
|    
|     David Miller reported that hrtick update overhead has tripled the
|     wakeup overhead on Sparc64.
|    
|     That is too much - disable the HRTICK feature for now by default,
|     until a faster implementation is found.
|    
|     Reported-by: David Miller <davem@...emloft.net>
|     Acked-by: Peter Zijlstra <peterz@...radead.org>
|     Signed-off-by: Ingo Molnar <mingo@...e.hu>

Which was included in v2.6.28-rc1 already.

	Ingo
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