Subject: Re: severe slowdown with 2.4 series w/heavy disk access
To: pboley@home.com (Paul Boley)
Date: Wed, 26 Dec 2001 17:36:46 +0000 (GMT)
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <3C2855EF.DC7F584F@home.com> from "Paul Boley" at Dec 25, 2001 05:33:19 AM
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Message-Id: <E16JHyw-0002TX-00@the-village.bc.nu>
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Sender: linux-kernel-owner@vger.kernel.org

> When this happens in X, the mouse drags and skips, any processes running
> (like tar/gzip. ls in an empty dir takes about 10 seconds) slow down,
> and it happens usually for about 10sec-2min, often for no apparent
> reason.  The big decompression was just a way I can easily duplicate
> it.  Oddly enough though, according to top, it caches all that memory at

Ok

> once, and my free goes down to 5 megs, with the system hanging/slow to

The free behaviour is correct (free memory is wasted memory). The delays are
obviously not

> under 1% cpu while this happens, and about 50% of the cpu is in use by
> the system (not by any processes that I can see.  kupdated goes up to
> about 0.3% during this)

> > Also what disks do you have and how are they set up ?
> > -

[I meant are they in DMA / UDMA modes ?]

Alan

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