From: James Bottomley <James.Bottomley@steeleye.com>
To: "Salyzyn, Mark" <mark_salyzyn@adaptec.com>
Cc: Christoph Hellwig <hch@infradead.org>, Alan Cox <alan@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
SCSI Mailing List <linux-scsi@vger.kernel.org>
Subject: RE: PATCH: Further aacraid work
Date: 17 Jun 2004 09:55:03 -0500 [thread overview]
Message-ID: <1087484107.2090.42.camel@mulgrave> (raw)
In-Reply-To: <547AF3BD0F3F0B4CBDC379BAC7E4189FD2402C@otce2k03.adaptec.com>
On Thu, 2004-06-17 at 09:39, Salyzyn, Mark wrote:
> This would not be such an issue if Linux provided large SG elements
> rather than the fubar descending page order ones they issue today. If
> this could be fixed, I'd not even be interested in the optimization of
> the SG.
This is hardly a big problem, is it? it only occurs during the first
few moments of system operation. After that, the pages assigned to a
virtual region are pretty much random.
Fundamentally, sg lists have to operate at the level of the MMU, so
we're stuck with the page size, which is 4k on x86. There's nothing we
can do in SCSI about this.
Of course, if you're on a platform with an IOMMU then this problem
simply doesn't exist and we can coalesce nicely.
James
next prev parent reply other threads:[~2004-06-17 14:57 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-17 14:39 PATCH: Further aacraid work Salyzyn, Mark
2004-06-17 14:55 ` James Bottomley [this message]
2004-06-17 14:58 ` Alan Cox
2004-06-17 15:15 ` Arjan van de Ven
2004-06-17 19:16 ` James Bottomley
2004-06-17 16:32 ` Clay Haapala
2004-06-17 16:37 ` James Bottomley
2004-06-17 16:46 ` Alan Cox
2004-06-17 15:11 ` Anton Blanchard
-- strict thread matches above, loose matches on Subject: below --
2004-06-29 20:55 Salyzyn, Mark
2004-06-29 23:22 ` Byron Stanoszek
2004-06-30 19:52 ` Byron Stanoszek
2004-06-30 19:59 ` Dario
2004-06-29 19:27 Salyzyn, Mark
2004-06-29 20:20 ` Byron Stanoszek
2004-06-29 20:42 ` Alan Cox
2004-06-29 18:53 Salyzyn, Mark
2004-06-29 19:03 ` Byron Stanoszek
2004-06-28 13:17 Salyzyn, Mark
2004-06-18 20:53 Salyzyn, Mark
[not found] <286GI-5y3-11@gated-at.bofh.it>
[not found] ` <286Qp-5EU-19@gated-at.bofh.it>
2004-06-17 19:10 ` Andi Kleen
2004-06-17 20:54 ` Alan Cox
2004-06-17 21:13 ` James Bottomley
2004-06-17 21:25 ` Andi Kleen
2004-06-18 15:19 ` Benjamin Herrenschmidt
2004-06-18 5:57 ` Jeff Garzik
2004-06-18 14:07 ` James Bottomley
2004-06-18 15:17 ` Benjamin Herrenschmidt
2004-06-17 17:54 Salyzyn, Mark
2004-06-17 20:38 ` Alan Cox
2004-06-17 20:48 ` William Lee Irwin III
2004-06-17 20:56 ` James Bottomley
2004-06-18 15:05 ` William Lee Irwin III
2004-06-18 20:32 ` William Lee Irwin III
2004-06-27 17:33 ` James Bottomley
2004-06-17 12:53 Salyzyn, Mark
2004-06-17 13:07 ` Matthew Wilcox
2004-06-17 13:19 ` Christoph Hellwig
2004-06-17 13:55 ` James Bottomley
2004-06-17 13:32 ` Christoph Hellwig
2004-06-17 14:02 ` Alan Cox
2004-06-16 21:04 Alan Cox
2004-06-16 21:33 ` Christoph Hellwig
2004-06-16 21:40 ` Alan Cox
2004-06-16 21:42 ` Christoph Hellwig
2004-06-16 21:48 ` Alan Cox
2004-06-16 21:58 ` Christoph Hellwig
2004-06-16 22:06 ` Alan Cox
2004-06-29 17:48 ` Byron Stanoszek
2004-06-29 18:27 ` Mark Haverkamp
2004-06-29 18:37 ` Alan Cox
2004-06-30 2:02 ` bm
2004-06-30 16:07 ` Alan Cox
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