From: Eric Mudama <edmudama@gmail.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Clem Taylor <clemtaylor@comcast.net>,
Jeff Garzik <jgarzik@pobox.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Re: Any news on a higher performance sata_sil SIL_QUIRK_MOD15WRITE workaround?
Date: Mon, 16 Aug 2004 12:49:47 -0600 [thread overview]
Message-ID: <311601c904081611491c23207d@mail.gmail.com> (raw)
In-Reply-To: <1092399186.24406.15.camel@localhost.localdomain>
I'm not sure about "affected" drives, but the issue as Jeff pointed
out is that SI3112/3114 send write data to the host in non-multiples
of 512 bytes, if the command exceeds 15 LBAs in size.
Up to 15*512 bytes gives you a single FIS of 15*512, for anything
larger they have an internal algorithm that is pretty easy to figure
out with a bus trace.
To work with drives that aren't capable of handling this, you can't
issue writes > 15 LBAs to the drive, hence the blacklist/workaround.
--eric
prev parent reply other threads:[~2004-08-16 18:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-12 5:16 Any news on a higher performance sata_sil SIL_QUIRK_MOD15WRITE workaround? Clem Taylor
2004-08-12 6:43 ` Jeff Garzik
2004-08-12 12:00 ` Alan Cox
2004-08-12 15:16 ` Jeff Garzik
2004-08-12 19:59 ` Alan Cox
2004-08-12 21:03 ` Jeff Garzik
2004-08-12 20:37 ` Alan Cox
2004-08-13 4:18 ` Clem Taylor
2004-08-13 12:13 ` Alan Cox
2004-08-16 18:49 ` Eric Mudama [this message]
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