From: Ric Wheeler <rwheeler@redhat.com>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Matthew Wilcox <matthew@wil.cx>,
Boaz Harrosh <bharrosh@panasas.com>,
linux-scsi@vger.kernel.org
Subject: Re: [DO NOT APPLY] sd take advantage of rotation speed
Date: Mon, 28 Jul 2008 09:36:26 -0400 [thread overview]
Message-ID: <488DCB5A.9080105@redhat.com> (raw)
In-Reply-To: <yq1d4m575je.fsf@sermon.lab.mkp.net>
Martin K. Petersen wrote:
>>>>>> "Jens" == Jens Axboe <jens.axboe@oracle.com> writes:
>>>>>>
>
> Jens> Uhm, but it IS "a blatant layering violation", it's doing things
> Jens> from the wrong side up :-)
>
> I also disagree with mucking with the elevator directly in sd.c.
>
> The whole point of my I/O hints work is to expose the I/O topology in
> a generic fashion so that upper layers can take advantage of them.
>
> I'll post a new batch of those patches shortly...
>
>
One other thought - is there a way to give non-rotational devices also
some indication of latency? (FLASH is slower than enterprise SSD is
slower than DRAM ramdisk for example)?
ric
next prev parent reply other threads:[~2008-07-28 13:38 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-19 16:03 [DO NOT APPLY] sd take advantage of rotation speed Matthew Wilcox
2008-06-19 17:12 ` Mike Anderson
2008-06-19 18:10 ` Matthew Wilcox
2008-06-22 12:16 ` Boaz Harrosh
2008-06-22 13:19 ` Matthew Wilcox
2008-06-22 13:27 ` Boaz Harrosh
2008-06-22 13:38 ` James Bottomley
2008-06-22 14:03 ` Matthew Wilcox
2008-06-22 14:41 ` Martin K. Petersen
2008-06-22 18:44 ` Matthew Wilcox
2008-06-25 2:06 ` Martin K. Petersen
2008-06-22 17:26 ` James Bottomley
2008-06-25 13:47 ` Jens Axboe
2008-06-25 13:57 ` Jens Axboe
2008-06-25 14:24 ` Ric Wheeler
2008-06-25 16:25 ` Boaz Harrosh
2008-06-25 16:57 ` Jens Axboe
2008-06-25 17:20 ` Matthew Wilcox
2008-06-25 17:26 ` Jens Axboe
2008-06-25 17:34 ` Matthew Wilcox
2008-06-25 17:43 ` James Bottomley
2008-06-25 17:53 ` Matthew Wilcox
2008-06-25 18:01 ` Jens Axboe
2008-06-25 18:06 ` James Bottomley
2008-06-25 17:59 ` Jens Axboe
2008-06-25 18:06 ` Martin K. Petersen
2008-06-25 18:12 ` Jens Axboe
2008-07-28 13:36 ` Ric Wheeler [this message]
2008-07-28 14:10 ` James Bottomley
2008-07-28 14:31 ` Martin K. Petersen
2008-07-31 21:00 ` Grant Grundler
2008-07-31 21:19 ` Andrew Patterson
2008-07-31 22:26 ` Ric Wheeler
2008-07-31 23:44 ` Grant Grundler
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=488DCB5A.9080105@redhat.com \
--to=rwheeler@redhat.com \
--cc=bharrosh@panasas.com \
--cc=jens.axboe@oracle.com \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
--cc=matthew@wil.cx \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.