From: Con Kolivas <kernel@kolivas.org>
To: Marc Perkel <marc@perkel.com>
Subject: Re: Making nice niser for system hogging programs
Date: Sun, 2 Oct 2005 13:07:08 +1000
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On Sun, 2 Oct 2005 12:26, Marc Perkel wrote:
> Just a thought -----
>
> Programs like cp -a /bigdir /backup and rsync usually bring the server
> to a crawl no matter how much "nice" you put on them. Is there any way
> to make "nice" smarter in that it limits io as well as processor usage?
> If cp and rsyne ran a little slower IO wise then everything else could
> run too.

The latest cfq io scheduler supports io nice levels. By default it links th=
e=20
io nice levels to the cpu nice levels so if you use cfq and set your file=20
commands nice 19 they will use as little io priority as possible. Note this=
=20
only works on the read side but that makes a dramatic difference already.

Cheers
Con

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