linux-kernel - Re: Linux 2.6.29

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Message-ID: <49CA9324.6010407@redhat.com>
Date:	Wed, 25 Mar 2009 16:25:08 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Jeff Garzik <jeff@...zik.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	Ric Wheeler <rwheeler@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>, David Rees <drees76@...il.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

Jeff Garzik wrote:
> Ric Wheeler wrote:> And, as I am sure that you do know, to add insult 
> to injury, FLUSH_CACHE
>> is per device (not file system).
>>
>> When you issue an fsync() on a disk with multiple partitions, you 
>> will flush the data for all of its partitions from the write cache....
>
> SCSI'S SYNCHRONIZE CACHE command already accepts an (LBA, length) 
> pair.  We could make use of that.
>
> And I bet we could convince T13 to add FLUSH CACHE RANGE, if we could 
> demonstrate clear benefit.
>
>     Jeff

How well supported is this in SCSI?  Can we try it out with a commodity 
SAS drive?

Ric

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