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Date: Sun, 11 Feb 2001 19:22:13 +0100 (CET)
From: Mike Galbraith <mikeg@wen-online.de>
To: Rik van Riel <riel@conectiva.com.br>
cc: Marcelo Tosatti <marcelo@conectiva.com.br>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>, linux-kernel@vger.kernel.org
Subject: Re: Linux 2.4.1-ac7
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Message-ID: <Pine.Linu.4.10.10102111814140.521-100000@mikeg.weiden.de>
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On Sun, 11 Feb 2001, Rik van Riel wrote:

> On Sun, 11 Feb 2001, Mike Galbraith wrote:
> > On Sun, 11 Feb 2001, Mike Galbraith wrote:
> > 
> > > Something else I see while watching it run:  MUCH more swapout than
> > > swapin.  Does that mean we're sending pages to swap only to find out
> > > that we never need them again?
> > 
> > (numbers might be more descriptive)
> > 
> > user  :       0:07:21.70  54.3%  page in :   142613
> > nice  :       0:00:00.00   0.0%  page out:   155454
> > system:       0:03:40.63  27.1%  swap in :    56334
> > idle  :       0:02:30.50  18.5%  swap out:   149872
> > uptime:       0:13:32.83         context :   519726
> 
> Indeed, in this case we send a lot more pages to swap
> than we read back in from swap, this means that the
> data is still sitting in swap space and was never needed
> again.

But it looks and feels (box is I/O hyper-saturated) like
it wrote it all to disk.

(btw, ac5 does more disk read.. ie the reduced cache size
of earlier kernels under heavy pressure does have it's price
with this workload.. quite visible in agregates.  looks to
be much cheaper than swap though.. for this workload)

	-Mike

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