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
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