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From: "Hemmann, Volker Armin" <volker.armin.hemmann@tu-clausthal.de>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user]  linux' IO performance sucks
Date: Wed, 5 Jul 2006 07:45:00 +0200
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On Wednesday 05 July 2006 05:43, Sven K=F6hler wrote:
> Hi,
>
> sorry for the silly subject, but did you ever experience the following?=
:
>
> i have a fileserver, i copy a file to it - let's say 600MB.
>
> So about every 200MB (i guess the linux box writes the data into the
> cache in the RAM first) linux writes the harddisk. But during that time
> - during the time it writes that 200MB to disk, there is no chance for
> any other IO. I'm playing an mp3 from the very same fileserver. It stop=
s
> playing, because the machine does answer the read-requests.
>
> So what's going on here?
>
> Why does Linux write so huge amounts of data to the disk? Why does Linu=
x
> not stop writing for a while to fullfil the read-requests? And so on ...
>
> Any idea, on how to imrpove that?

using the cfq or deadline io-scheduler?

--=20
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