From: Jens Axboe <axboe@suse.de>
To: Andrew Morton <akpm@digeo.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] deadline io scheduler
Date: Thu, 26 Sep 2002 08:59:51 +0200 [thread overview]
Message-ID: <20020926065951.GD12862@suse.de> (raw)
In-Reply-To: <20020926064455.GC12862@suse.de>
On Thu, Sep 26 2002, Jens Axboe wrote:
> > Now alter fifo_batch, everything else default:
> >
> > fifo_batch (units) time cat kernel/*.c (secs)
> > 64 5.0
> > 32 2.0
> > 16 0.2
> > 8 0.17
> >
> > OK, that's a winner.
>
> Cool, I'm resting benchmarks with 16 as the default now. I fear this
> might be too agressive, and that 32 will be a decent value.
fifo_batch=16 drops throughput slightly on tiobench, however it also
gives really really good interactive behaviour here. Using 32 doesn't
change that a whole lot, the throughput that is. This might just be
normal deviation between runs, more are needed to be sure. Note that
I'm testing with the last_sec patch I posted, you should too.
BTW, for SCSI, it would be nice to first convert more drivers to use the
block level queued tagging. That would provide us with a much better
means to control starvation properly on SCSI as well.
--
Jens Axboe
next prev parent reply other threads:[~2002-09-26 6:54 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-25 17:20 [PATCH] deadline io scheduler Jens Axboe
2002-09-26 6:15 ` Andrew Morton
2002-09-26 6:27 ` David S. Miller
2002-09-26 6:44 ` Jens Axboe
2002-09-26 6:59 ` Jens Axboe [this message]
2002-09-26 7:06 ` William Lee Irwin III
2002-09-26 7:06 ` David S. Miller
2002-09-26 7:16 ` Jeff Garzik
2002-09-26 7:13 ` David S. Miller
2002-09-26 7:33 ` Jeff Garzik
2002-09-26 7:35 ` David S. Miller
2002-09-26 8:15 ` Michael Clark
2002-09-26 8:18 ` William Lee Irwin III
2002-09-26 17:41 ` Mike Anderson
2002-09-26 18:03 ` Jeff Garzik
2002-09-26 19:21 ` Mike Anderson
2002-09-27 5:41 ` Andrew Vasquez
2002-09-27 5:57 ` Jeff Garzik
2002-09-27 16:58 ` Mike Anderson
2002-09-26 22:41 ` Matt Porter
2002-09-26 22:35 ` Mark Bellon
2002-09-26 20:21 ` Thomas Tonino
2002-09-26 7:41 ` Jeff Garzik
2002-09-26 7:23 ` William Lee Irwin III
2002-09-26 7:11 ` Jeff Garzik
2002-09-26 7:14 ` William Lee Irwin III
2002-09-26 15:54 ` Patrick Mansfield
2002-09-30 8:15 ` Jens Axboe
2002-09-30 15:39 ` Patrick Mansfield
2002-09-30 16:08 ` Jens Axboe
2002-09-26 8:28 ` Daniel Pittman
2002-09-26 8:29 ` Jens Axboe
2002-09-26 23:23 ` Daniel Pittman
2002-09-30 8:10 ` Jens Axboe
2002-09-26 15:09 ` Rik van Riel
2002-09-26 7:12 ` Andrew Morton
2002-09-26 7:17 ` Jens Axboe
2002-09-26 7:34 ` Jens Axboe
2002-09-30 7:45 ` Pavel Machek
2002-10-02 5:35 ` Jens Axboe
2002-09-27 16:01 Andrew Vasquez
2002-09-27 17:07 ` Mike Anderson
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