linux-kernel - Re: [REPORT] cfs-v5 vs sd-0.46

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Date:	Tue, 24 Apr 2007 11:06:29 +0200
From:	Michael Gerdau <mgd@...hnosis.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Gene Heskett <gene.heskett@...il.com>,
	Juliusz Chroboczek <jch@....jussieu.fr>,
	Mike Galbraith <efault@....de>,
	Peter Williams <pwil3058@...pond.net.au>,
	ck list <ck@....kolivas.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	William Lee Irwin III <wli@...omorphy.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bill Davidsen <davidsen@....com>, Willy Tarreau <w@....eu>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [REPORT] cfs-v5 vs sd-0.46

> oh, you are writing the number-cruncher?

Yep.

> In general the 'best'  
> performance metrics for scheduler validation are the ones where you have 
> immediate feedback: i.e. some ops/sec (or ops per minute) value in some 
> readily accessible place, or some "milliseconds-per-100,000 ops" type of 
> metric - whichever lends itself better to the workload at hand.

I'll have to see whether that works out. I don't have an easily
available ops/sec but I guess I could create something similar.

> If you  
> measure time then the best is to use long long and nanoseconds and the 
> monotonic clocksource:

[snip]
Thanks, I will implement that, for Linux anyway.

> Plus an absolute metric of "the whole workload took X.Y seconds" is 
> useful too.

That's the easiest to come by and is already available.

Best,
Michael
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