From: Vivek Goyal <vgoyal@redhat.com>
To: Valdis.Kletnieks@vt.edu
Cc: Mike Galbraith <efault@gmx.de>,
Corrado Zoccolo <czoccolo@gmail.com>,
Jens Axboe <jens.axboe@oracle.com>, Ingo Molnar <mingo@elte.hu>,
Ulrich Lukas <stellplatz-nr.13a@datenparkplatz.de>,
linux-kernel@vger.kernel.org,
containers@lists.linux-foundation.org, dm-devel@redhat.com,
nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com,
mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it,
ryov@valinux.co.jp, fernando@oss.ntt.co.jp, jmoyer@redhat.com,
dhaval@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com,
righi.andrea@gmail.com, m-ikeda@ds.jp.nec.com, agk@redhat.com,
akpm@linux-foundation.org, peterz@infradead.org,
jmarchan@redhat.com, torvalds@linux-foundation.org,
riel@redhat.com
Subject: Re: IO scheduler based IO controller V10
Date: Fri, 2 Oct 2009 15:58:15 -0400 [thread overview]
Message-ID: <20091002195815.GE4494@redhat.com> (raw)
In-Reply-To: <12774.1254502217@turing-police.cc.vt.edu>
On Fri, Oct 02, 2009 at 12:50:17PM -0400, Valdis.Kletnieks@vt.edu wrote:
> On Fri, 02 Oct 2009 11:40:20 EDT, Vivek Goyal said:
>
> > In that case, Corrado's suggestion of refining it further and disabling idling
> > for seeky process only on non-rotational media (SSD and hardware RAID), makes
> > sense to me.
>
> Umm... I got petabytes of hardware RAID across the hall that very definitely
> *is* rotating. Did you mean "SSD and disk systems with big honking caches
> that cover up the rotation"? Because "RAID" and "big honking caches" are
> not *quite* the same thing, and I can just see that corner case coming out
> to bite somebody on the ass...
>
I guess both. The systems which have big caches and cover up for rotation,
we probably need not idle for seeky process. An in case of big hardware
RAID, having multiple rotating disks, instead of idling and keeping rest
of the disks free, we probably are better off dispatching requests from
next queue (hoping it is going to a different disk altogether).
Thanks
Vivek
next prev parent reply other threads:[~2009-10-02 20:00 UTC|newest]
Thread overview: 140+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-02 10:55 IO scheduler based IO controller V10 Corrado Zoccolo
2009-10-02 11:04 ` Jens Axboe
2009-10-02 12:49 ` Vivek Goyal
2009-10-02 15:27 ` Corrado Zoccolo
2009-10-02 15:31 ` Vivek Goyal
2009-10-02 15:32 ` Mike Galbraith
2009-10-02 15:40 ` Vivek Goyal
2009-10-02 16:03 ` Mike Galbraith
2009-10-02 16:50 ` Valdis.Kletnieks
2009-10-02 19:58 ` Vivek Goyal [this message]
2009-10-02 22:14 ` Corrado Zoccolo
2009-10-02 22:27 ` Vivek Goyal
2009-10-03 12:43 ` Corrado Zoccolo
2009-10-03 13:38 ` Do we support ioprio on SSDs with NCQ (Was: Re: IO scheduler based IO controller V10) Vivek Goyal
2009-10-04 9:15 ` Corrado Zoccolo
2009-10-04 12:11 ` Vivek Goyal
2009-10-04 12:46 ` Corrado Zoccolo
2009-10-04 16:20 ` Fabio Checconi
2009-10-05 21:21 ` Corrado Zoccolo
2009-10-05 15:06 ` Jeff Moyer
2009-10-05 21:09 ` Corrado Zoccolo
2009-10-06 8:41 ` Jens Axboe
2009-10-06 9:00 ` Corrado Zoccolo
2009-10-06 18:53 ` Jens Axboe
2009-10-06 21:36 ` Vivek Goyal
-- strict thread matches above, loose matches on Subject: below --
2009-09-24 19:25 IO scheduler based IO controller V10 Vivek Goyal
2009-09-24 21:33 ` Andrew Morton
2009-09-25 1:09 ` KAMEZAWA Hiroyuki
2009-09-25 1:18 ` KAMEZAWA Hiroyuki
2009-09-25 5:29 ` Balbir Singh
2009-09-25 7:09 ` Ryo Tsuruta
2009-09-25 4:14 ` Vivek Goyal
2009-09-25 5:04 ` Vivek Goyal
2009-09-25 9:07 ` Ryo Tsuruta
2009-09-25 14:33 ` Vivek Goyal
2009-09-28 7:30 ` Ryo Tsuruta
2009-09-25 15:04 ` Rik van Riel
2009-09-28 7:38 ` Ryo Tsuruta
2009-09-25 2:20 ` Ulrich Lukas
2009-09-25 20:26 ` Vivek Goyal
2009-09-26 14:51 ` Mike Galbraith
2009-09-27 6:55 ` Mike Galbraith
2009-09-27 16:42 ` Jens Axboe
2009-09-27 18:15 ` Mike Galbraith
2009-09-28 4:04 ` Mike Galbraith
2009-09-28 5:55 ` Mike Galbraith
2009-09-28 17:48 ` Vivek Goyal
2009-09-28 18:24 ` Mike Galbraith
2009-09-30 19:58 ` Mike Galbraith
2009-09-30 20:05 ` Mike Galbraith
2009-09-30 20:24 ` Vivek Goyal
2009-10-01 7:33 ` Mike Galbraith
2009-10-01 18:58 ` Jens Axboe
2009-10-02 6:23 ` Mike Galbraith
2009-10-02 8:04 ` Jens Axboe
2009-10-02 8:53 ` Mike Galbraith
2009-10-02 9:00 ` Mike Galbraith
2009-10-02 9:55 ` Jens Axboe
2009-10-02 12:22 ` Mike Galbraith
2009-10-02 9:24 ` Ingo Molnar
2009-10-02 9:28 ` Jens Axboe
2009-10-02 14:24 ` Linus Torvalds
2009-10-02 14:45 ` Mike Galbraith
2009-10-02 14:57 ` Jens Axboe
2009-10-02 14:56 ` Jens Axboe
2009-10-02 15:14 ` Linus Torvalds
2009-10-02 16:01 ` jim owens
2009-10-02 17:11 ` Jens Axboe
2009-10-02 17:20 ` Ingo Molnar
2009-10-02 17:25 ` Jens Axboe
2009-10-02 17:28 ` Ingo Molnar
2009-10-02 17:37 ` Jens Axboe
2009-10-02 17:56 ` Ingo Molnar
2009-10-02 18:04 ` Jens Axboe
2009-10-02 18:22 ` Mike Galbraith
2009-10-02 18:26 ` Jens Axboe
2009-10-02 18:33 ` Mike Galbraith
2009-10-02 18:36 ` Theodore Tso
2009-10-02 18:45 ` Jens Axboe
2009-10-02 19:01 ` Ingo Molnar
2009-10-02 19:09 ` Jens Axboe
2009-10-02 18:13 ` Mike Galbraith
2009-10-02 18:19 ` Jens Axboe
2009-10-02 18:57 ` Mike Galbraith
2009-10-02 20:47 ` Mike Galbraith
2009-10-03 5:48 ` Mike Galbraith
2009-10-03 5:56 ` Mike Galbraith
2009-10-03 7:24 ` Jens Axboe
2009-10-03 9:00 ` Mike Galbraith
2009-10-03 9:12 ` Corrado Zoccolo
2009-10-03 13:18 ` Jens Axboe
2009-10-03 13:17 ` Jens Axboe
2009-10-03 11:29 ` Vivek Goyal
2009-10-03 7:20 ` Ingo Molnar
2009-10-03 7:25 ` Jens Axboe
2009-10-03 8:53 ` Mike Galbraith
2009-10-03 9:01 ` Corrado Zoccolo
2009-10-02 16:33 ` Ray Lee
2009-10-02 17:13 ` Jens Axboe
2009-10-02 16:22 ` Ingo Molnar
2009-10-02 9:36 ` Mike Galbraith
2009-10-02 16:37 ` Ingo Molnar
2009-10-02 18:08 ` Jens Axboe
2009-10-02 18:29 ` Mike Galbraith
2009-10-02 18:36 ` Jens Axboe
2009-09-27 17:00 ` Corrado Zoccolo
2009-09-28 14:56 ` Vivek Goyal
2009-09-28 15:35 ` Corrado Zoccolo
2009-09-28 17:14 ` Vivek Goyal
2009-09-29 7:10 ` Corrado Zoccolo
2009-09-28 17:51 ` Mike Galbraith
2009-09-28 18:18 ` Vivek Goyal
2009-09-28 18:53 ` Mike Galbraith
2009-09-29 7:14 ` Corrado Zoccolo
2009-09-29 5:55 ` Mike Galbraith
2009-09-29 0:37 ` Nauman Rafique
2009-09-29 3:22 ` Vivek Goyal
2009-09-29 9:56 ` Ryo Tsuruta
2009-09-29 10:49 ` Takuya Yoshikawa
2009-09-29 14:10 ` Vivek Goyal
2009-09-29 19:53 ` Nauman Rafique
2009-09-30 8:43 ` Ryo Tsuruta
2009-09-30 11:05 ` Vivek Goyal
2009-10-01 6:41 ` Ryo Tsuruta
2009-10-01 13:31 ` Vivek Goyal
2009-10-02 2:57 ` Vivek Goyal
2009-10-02 20:27 ` Munehiro Ikeda
2009-10-05 10:38 ` Ryo Tsuruta
2009-10-05 12:31 ` Vivek Goyal
2009-10-05 14:55 ` Ryo Tsuruta
2009-10-05 17:10 ` Vivek Goyal
2009-10-05 18:11 ` Nauman Rafique
2009-10-06 7:17 ` Ryo Tsuruta
2009-10-06 11:22 ` Vivek Goyal
2009-10-07 14:38 ` Ryo Tsuruta
2009-10-07 15:09 ` Vivek Goyal
2009-10-08 2:18 ` Ryo Tsuruta
2009-10-07 16:41 ` Rik van Riel
2009-10-08 10:22 ` Ryo Tsuruta
2009-09-30 3:11 ` Vivek Goyal
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