Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3 / aa / rmap with contest]

From: Jens Axboe (
Date: Tue Feb 11 2003 - 06:01:09 EST

On Mon, Feb 10 2003, Pavel Machek wrote:
> Hi!
> > The design I proposed is to have multiple I/O queues, where to apply the
> > elevator, and to choose the queue in function of the task->pid that is
> > sumbitting the bh/bio. You'll have to apply an hash to the pid and you
> > probably want a perturbation timer that will change the hash function
> > every 30 sec or so. Plus I want a special queue for everything
> > asynchronoys. So that the asynchronoys queue will be elevated and
> What about adding speicial queue (queues?) for niced things? That way
> nice -20 job would not interfere with normal processes, not even for
> I/O.

Once you have per-process queues, it's fairly trivial to add stuff like

Jens Axboe

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to More majordomo info at Please read the FAQ at

This archive was generated by hypermail 2b29 : Sat Feb 15 2003 - 22:00:33 EST