linux-kernel - Re: fair clock use in CFS

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Message-ID: <20070514112259.GC28348@in.ibm.com>
Date:	Mon, 14 May 2007 16:52:59 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	William Lee Irwin III <wli@...omorphy.com>
Cc:	Ingo Molnar <mingo@...e.hu>, efault@....de, tingy@...umass.edu,
	linux-kernel@...r.kernel.org
Subject: Re: fair clock use in CFS

On Mon, May 14, 2007 at 04:05:00AM -0700, William Lee Irwin III wrote:
> The variability in ->fair_clock advancement rate was the mistake, at
> least according to my way of thinking. The queue's virtual time clock
> effectively stops under sufficiently high load, possibly literally in
> the event of fixpoint underflow. 

[snip]

> Basically it needs to move closer to EEVDF in these respects.

Doesn't EEVDF have the same issue? From the paper:

	V(t) = 1/(w1 + w2 + ...wn)

-- 
Regards,
vatsa
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