linux-kernel - Re: [PATCH 1/7] block: Add block_flush

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Date:	Tue, 31 Mar 2009 09:28:18 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Mark Lord <lkml@....ca>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>, Jeff Garzik <jeff@...zik.org>,
	Christoph Hellwig <hch@...radead.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>,
	david@...morbit.com, tj@...nel.org
Subject: Re: [PATCH 1/7] block: Add block_flush_device()

On Tue, 2009-03-31 at 09:23 -0400, Mark Lord wrote:
> Chris Mason wrote:
> >
> > You can test this pretty easily:
> > 
> > dd if=/dev/zero of=foo bs=4k count=10000 oflag=direct
> > 
> > If that runs faster than 1MB/s the write cache is still on.
> ..
> 
> Or simply:   hdparm -W /dev/sd?   ## (for SATA/PATA drives)

I'm afraid I tend to hammer on the drive instead of asking it politely,
but I guess hdparm is trust worthy these days ;)

-chris


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