From: Jens Axboe <axboe@suse.de>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Jamie Lokier <jamie@shareable.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-ide@vger.kernel.org,
Linux Kernel <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] speed up SATA
Date: Sun, 28 Mar 2004 19:40:13 +0200 [thread overview]
Message-ID: <20040328174013.GJ24370@suse.de> (raw)
In-Reply-To: <40670A36.3000005@pobox.com>
On Sun, Mar 28 2004, Jeff Garzik wrote:
> Jamie Lokier wrote:
> >Jeff Garzik wrote:
> >
> >>TCQ-on-write for ATA disks is yummy because you don't really know what
> >>the heck the ATA disk is writing at the present time. By the time the
> >>Linux disk scheduler gets around to deciding it has a nicely merged and
> >>scheduled set of requests, it may be totally wrong for the disk's IO
> >>scheduler. TCQ gives the disk a lot more power when the disk integrates
> >>writes into its internal IO scheduling.
> >
> >
> >Does TCQ-on-write allow you to do ordered write commits, as with barriers,
> >but without needing full cache flushes, and still get good performance?
>
> Nope, TCQ is just a bunch of commands rather than one. There are no
> special barrier indicators you can pass down with a command.
What would be nice (and I seem to recall that Andre also pushed for
this) would be the FUA bit doubling as an ordered tag indicator when
using TCQ. It's one of those things that keep ATA squarely outside of
the big machine uses. That other OS had a differing opinion of what to
do with that, so...
--
Jens Axboe
next prev parent reply other threads:[~2004-03-28 17:41 UTC|newest]
Thread overview: 115+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-27 22:37 [PATCH] speed up SATA Jeff Garzik
2004-03-27 23:04 ` Stefan Smietanowski
2004-03-27 23:11 ` Jeff Garzik
2004-03-28 7:23 ` Stefan Smietanowski
2004-03-28 15:37 ` Bartlomiej Zolnierkiewicz
2004-03-27 23:32 ` Bartlomiej Zolnierkiewicz
2004-03-27 23:36 ` Jeff Garzik
2004-03-27 23:40 ` Jeff Garzik
2004-03-28 0:13 ` Bartlomiej Zolnierkiewicz
2004-03-28 0:08 ` Jeff Garzik
2004-03-29 11:42 ` Pavel Machek
2004-03-27 23:37 ` Nick Piggin
2004-03-27 23:44 ` Jeff Garzik
2004-03-27 23:47 ` Nick Piggin
2004-03-27 23:59 ` Jeff Garzik
2004-03-28 14:10 ` Jens Axboe
2004-03-28 17:31 ` Jeff Garzik
2004-03-28 17:35 ` Jens Axboe
2004-03-28 17:48 ` Jeff Garzik
2004-03-28 17:54 ` Jens Axboe
2004-03-28 18:08 ` Jamie Lokier
2004-03-28 18:15 ` Jens Axboe
2004-03-28 18:55 ` Jeff Garzik
2004-03-29 8:09 ` Jens Axboe
2004-03-29 12:41 ` Jamie Lokier
2004-03-29 12:44 ` Jens Axboe
2004-03-29 12:50 ` Jamie Lokier
2004-03-29 13:05 ` Arjan van de Ven
2004-03-29 13:08 ` Jens Axboe
2004-03-30 8:13 ` Kurt Garloff
2004-03-30 11:40 ` Jens Axboe
2004-03-29 17:19 ` Craig I. Hagan
2004-03-29 18:19 ` Jeff Garzik
2004-03-28 19:06 ` Jeff Garzik
2004-03-28 18:12 ` William Lee Irwin III
2004-03-28 18:17 ` Jens Axboe
2004-03-28 18:30 ` Bartlomiej Zolnierkiewicz
2004-03-28 18:30 ` Jens Axboe
2004-03-28 18:45 ` Bartlomiej Zolnierkiewicz
2004-03-28 18:59 ` Jeff Garzik
2004-03-28 20:32 ` Andrew Morton
2004-03-28 20:45 ` Jeff Garzik
2004-03-29 0:55 ` Andrea Arcangeli
2004-03-29 4:02 ` Jeff Garzik
2004-03-29 13:04 ` Andrea Arcangeli
2004-03-29 19:45 ` Jeff Garzik
2004-03-30 11:09 ` Jens Axboe
2004-03-30 15:54 ` Timothy Miller
2004-03-30 16:20 ` Jeff Garzik
2004-03-30 18:05 ` Timothy Miller
2004-03-30 17:50 ` Jeff Garzik
2004-03-30 18:19 ` Timothy Miller
2004-03-29 4:29 ` Wim Coekaerts
2004-03-29 7:32 ` Denis Vlasenko
2004-03-29 8:13 ` Jens Axboe
2004-03-29 13:05 ` Andrea Arcangeli
2004-03-29 4:31 ` William Lee Irwin III
2004-03-29 4:57 ` Jeff Garzik
2004-03-28 19:52 ` Nuno Silva
2004-03-28 20:02 ` Jeff Garzik
2004-03-28 0:06 ` Jeff Garzik
2004-03-28 0:15 ` Nick Piggin
2004-03-28 0:49 ` Jeff Garzik
2004-03-28 1:02 ` Andrew Morton
2004-03-28 1:09 ` Jeff Garzik
2004-03-28 13:59 ` Jens Axboe
2004-03-28 17:29 ` Jeff Garzik
2004-03-28 17:31 ` Jens Axboe
2004-03-28 13:51 ` Jamie Lokier
2004-03-28 17:24 ` Jeff Garzik
2004-03-28 17:36 ` Jamie Lokier
2004-03-28 17:54 ` Jeff Garzik
2004-03-28 20:50 ` Eric D. Mudama
2004-04-02 10:11 ` Jeremy Higdon
2004-04-02 16:11 ` Jamie Lokier
2004-04-03 10:48 ` Jeremy Higdon
2004-04-03 13:49 ` Jamie Lokier
2004-03-28 17:40 ` Jens Axboe [this message]
2004-03-28 17:49 ` Jeff Garzik
2004-03-28 17:55 ` Jens Axboe
2004-03-28 18:04 ` Jeff Garzik
2004-03-28 18:09 ` Jens Axboe
2004-03-28 20:12 ` Jeff Garzik
2004-03-28 20:54 ` Eric D. Mudama
2004-03-28 7:32 ` Stefan Smietanowski
2004-03-28 20:25 ` Jeff Garzik
2004-03-28 21:16 ` Stefan Smietanowski
2004-03-28 21:26 ` Jeff Garzik
2004-03-28 14:08 ` Jens Axboe
2004-03-28 17:38 ` Jeff Garzik
2004-03-28 17:45 ` Jens Axboe
2004-03-28 20:21 ` Jeff Garzik
2004-03-28 0:07 ` Andrew Morton
2004-03-28 0:21 ` Nick Piggin
2004-03-28 4:40 ` Eric D. Mudama
2004-03-28 6:56 ` Nick Piggin
2004-03-28 20:33 ` Eric D. Mudama
2004-03-28 20:59 ` Eric D. Mudama
2004-03-29 1:30 ` Nick Piggin
2004-03-29 5:24 ` Eric D. Mudama
2004-03-29 13:03 ` Jamie Lokier
2004-03-29 11:36 ` Pavel Machek
2004-03-29 18:46 ` David Lang
2004-03-29 20:13 ` Jeff Garzik
2004-03-30 5:55 ` Eric D. Mudama
2004-03-30 11:54 ` Marc Bevand
2004-03-30 13:07 ` Jens Axboe
2004-03-30 13:48 ` Marc Bevand
2004-03-30 13:49 ` Jens Axboe
2004-03-30 15:31 ` Jeff Garzik
2004-03-30 17:42 ` Jeff Garzik
2004-03-31 9:12 ` Marc Bevand
-- strict thread matches above, loose matches on Subject: below --
2004-03-31 5:47 Marcus Hartig
2004-03-31 6:56 ` Jeff Garzik
2004-03-31 16:07 ` Marcus Hartig
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