From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Mark Lord <liml@rtr.ca>
Cc: Jody McIntyre <scjody@sun.com>,
Grant Grundler <grundler@google.com>,
linux-ide@vger.kernel.org
Subject: Re: sata_mv performance; impact of NCQ
Date: Mon, 28 Apr 2008 18:53:38 +0100 [thread overview]
Message-ID: <20080428185338.0368ff32@core> (raw)
In-Reply-To: <48160C39.6000701@rtr.ca>
> Or at least that's how I understood Tejun's last explanation of it.
> It is possible that the drive firmware in some brands may not follow
> spec for FLUSH_CACHE_EXT, but I don't know of a specific instance of this.
For an ATA device it should be ok - the standard purposefully specified
flush cache functions in a way that was intended to stop drives lying for
benchmarketing reasons and the like. So you should always get proper
behaviour on any drive which implements it providing barriers are enabled
on the fs.
next prev parent reply other threads:[~2008-04-28 18:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-26 0:16 sata_mv performance; impact of NCQ Jody McIntyre
2008-04-26 3:13 ` Grant Grundler
2008-04-28 17:14 ` Jody McIntyre
2008-04-28 17:41 ` Mark Lord
2008-04-28 17:53 ` Alan Cox [this message]
2008-04-28 20:07 ` Jeff Garzik
2008-04-26 4:49 ` Mark Lord
2008-04-28 17:33 ` Jody McIntyre
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