linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Message-ID: <20070414105556.GC19454@elte.hu>
Date:	Sat, 14 Apr 2007 12:55:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	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>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]


* Daniel Walker <dwalker@...sta.com> wrote:

> One other thing, what happens in the case of slow, frequency changing, 
> are/or inaccurate clocks .. Is the old sched_clock behavior still 
> tolerated?

yeah, good question. Yesterday i did a quick testboot with that too, and 
it seemed to behave pretty OK with the low-res [jiffies based] 
sched_clock() too. Although in that case things are much more of an 
approximation and rounding/arithmetics artifacts are possible. CFS works 
best with a high-resolution cycle counter.

	Ingo
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