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From: Daniel Phillips <phillips@bonn-fries.net>
To: yodaiken@fsmlabs.com
Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable
Date: Mon, 21 Jan 2002 17:05:01 +0100
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Cc: yodaiken@fsmlabs.com, george anzinger <george@mvista.com>,
        Momchil Velikov <velco@fadata.bg>,
        Arjan van de Ven <arjan@fenrus.demon.nl>,
        Roman Zippel <zippel@linux-m68k.org>, linux-kernel@vger.kernel.org
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On January 21, 2002 04:43 pm, yodaiken@fsmlabs.com wrote:
> On Mon, Jan 21, 2002 at 04:38:59PM +0100, Daniel Phillips wrote:
> > On January 15, 2002 01:39 pm, yodaiken@fsmlabs.com wrote:
> > > My reservation about preemption as an implementation technique is that
> > > it has costs, which seem to be not easily boundable, but not very 
> > > clear benefits.
> > 
> > To me the benefit is clear enough: ASAP scheduling of IO threads, a 
> > simple heuristic that improves both throughput and latency.
> 
> I think of "benefit", perhaps naiively, in terms of something that can
> be measured or demonstrated rather than just announced.

But you see why asap scheduling improves latency/throughput *in theory*, 
don't you?  As for the measured benefit, there have been a steady stream of 
postive reports on lkml.  My own experience is that the usability of my 
laptop with its small memory is much improved under heavy IO load.

--
Daniel
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