linux-kernel - Re: Linux 2.6.29

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Date:	Tue, 31 Mar 2009 18:02:50 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	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:
> Jens Axboe wrote:
>> Another problem is that FLUSH_CACHE sucks. Really. And not just on
>> ext3/ordered, generally. Write a 50 byte file, fsync, flush cache and
>> wit for the world to finish. Pretty hard to teach people to use a nicer
>> fdatasync(), when the majority of the cost now becomes flushing the
>> cache of that 1TB drive you happen to have 8 partitions on. Good luck
>> with that.
>
> (responding to an email way back near the start of the thread)
>
> I emailed Microsoft about their proposal to add a WRITE BARRIER 
> command to ATA, documented at
> http://www.t13.org/Documents/UploadedDocuments/docs2007/e07174r0-Write_Barrier_Command_Proposal.doc 
>
>
> The MSFT engineer said they were definitely still pursuing this proposal.
>
> IMO we could look at this too, or perhaps come up with an alternate 
> proposal like FLUSH CACHE RANGE(s).
>
>     Jeff
>

I agree that it is worth getting better mechanisms in place - the cache 
flush is really primitive. Now we just need a victim to sit in on 
T13/T10 standards meetings :-)

ric

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