linux-kernel - Re: Linux 2.6.29

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Date:	Tue, 31 Mar 2009 18:22:15 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Ric Wheeler <rwheeler@...hat.com>
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>,
	Mark Lord <liml@....ca>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: Linux 2.6.29

Ric Wheeler wrote:
> 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).

> 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 :-)


Heck, we could even do a prototype implementation with the help of Mark 
Lord's sata_mv target mode support...

	Jeff



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