Re: [PATCH] CFQ scheduler, #2

From: Jens Axboe (
Date: Sat Feb 15 2003 - 03:33:15 EST

On Fri, Feb 14 2003, Ed Tomlinson wrote:
> Jens Axboe wrote:
> > The version posted the other day did fair queueing of requests between
> > processes, but it did not help to provide fair request allocation. This
> > version does that too, results are rather remarkable. In addition, the
> > following changes were made:
> The numbers from the second message are nice - especially considering this
> is only the second iteration...
> A question about io priorities. I wonder if they could not be implemented
> via a per pid cfq_quantum? If I am not missunderstanding things, a bigger
> value here for a given process should mean that it gets a larger share of
> the io bandwidth...

That's exactly right, and yes that would be one way of doing it.

Jens Axboe

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