linux-kernel - Re: [patch] CFS scheduler, -v8

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Date:	Wed, 2 May 2007 04:51:27 -0400
From:	Gene Heskett <gene.heskett@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>, Mark Lord <lkml@....ca>,
	Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>, Balbir Singh <balbir@...ibm.com>
Subject: Re: [patch] CFS scheduler, -v8

On Wednesday 02 May 2007, Ingo Molnar wrote:
>* Gene Heskett <gene.heskett@...il.com> wrote:
>> > I noticed a (harmless) bounds warning triggered by the reduction in
>> > size of array->bitmap.  Patchlet below.
>>
>> I just checked my logs, and it appears my workload didn't trigger this
>> one Mike. [...]
>
>yeah: this is a build-time warning and it needs a newer/smarter gcc to
>notice that provably redundant piece of code. It's a harmless thing -
>but nevertheless Mike's fix is a nice little micro-optimization as well:
>it always bothered me a bit that at 140 priority levels we were _just_
>past the 128 bits boundary by 12 bits. Now on 64-bit boxes it's just two
>64-bit words to cover all 100 priority levels of RT tasks.
>
>> [...]  And so far, v8 is working great here.  And that great is in my
>> best "Tony the Tiger" voice, stolen shamelessly from the breakfast
>> cereal tv commercial of 30+ years ago. :)
>
>heh :-)
>
>> Ingo asked for a 0-100 rating, where 0 is mainline as I recall it, and
>> 100 is the best of the breed.  I'll give this one a 100 till something
>> better shows up.
>
>nice - and you arent even using any OpenGL games ;)
>
>The 0-100 rating is really useful to me so that i can see the impact of
>regressions (if any) and it's also one single number representing the
>subjective impression - that way it's easier to keep tab of things.
>
>btw., do you still renice kmail slightly, or does it now work out of box
>with default nice 0?
>
>	Ingo

For this last couple of boots, its "right out of the box" and isn't getting 
under my skin.  A make -j4 didn't bother it either.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The goys have proven the following theorem...
		-- Physicist John von Neumann, at the start of a classroom
		   lecture.
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