From: Jeff Garzik <jeff@garzik.org>
To: Linus Torvalds <torvalds@osdl.org>
Cc: Steve Byan <smb@egenera.com>, Mark Lord <lkml@rtr.ca>,
Matthias Andree <matthias.andree@gmx.de>,
Douglas Gilbert <dougg@torque.net>, Mark Rustad <mrustad@mac.com>,
linux-scsi@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: sg regression in 2.6.16-rc5
Date: Fri, 03 Mar 2006 14:42:44 -0500 [thread overview]
Message-ID: <44089C34.2030604@garzik.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0603031035140.22647@g5.osdl.org>
Linus Torvalds wrote:
> For example, I think the IDE driver defaults to a maximum transfer of 256
> sectors, and the same number of max scatter-gather entries. Some
> controllers will actually lower that, due to silly hw problems.
Yep. Just to be specific:
256 max sectors IDE driver, 200 max sectors libata (due to driver not
hardware).
256 max s/g entries hardware limit, but due to a IOMMU merging worst
case libata (IDE driver too?) winds up with a 128 entry practical limit.
Newer SATA controllers eliminate the s/g entry limit and DMA boundary
limits, but its still 256 max-sectors for ATAPI (64k for LBA48 ATA).
Jeff
next prev parent reply other threads:[~2006-03-03 19:42 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-28 17:54 sg regression in 2.6.16-rc5 Mark Rustad
2006-02-28 19:53 ` Douglas Gilbert
2006-02-28 20:38 ` Kai Makisara
2006-03-01 2:04 ` Douglas Gilbert
2006-03-01 2:08 ` Mark Rustad
2006-03-01 8:38 ` Matthias Andree
2006-03-01 18:28 ` Linus Torvalds
2006-03-01 18:32 ` Mark Lord
2006-03-01 18:42 ` Linus Torvalds
2006-03-01 18:50 ` Matthew Wilcox
2006-03-03 18:27 ` Steve Byan
2006-03-03 18:55 ` Linus Torvalds
2006-03-03 19:13 ` Steve Byan
2006-03-03 19:42 ` Jeff Garzik [this message]
2006-03-03 20:09 ` Linus Torvalds
2006-03-03 20:30 ` Jeff Garzik
2006-03-01 19:33 ` Douglas Gilbert
2006-03-01 20:42 ` Mike Christie
2006-03-01 22:30 ` James Bottomley
2006-03-01 22:56 ` Mike Christie
2006-03-01 21:06 ` Kai Makisara
2006-03-02 19:50 ` Douglas Gilbert
2006-03-02 21:25 ` Linus Torvalds
2006-03-02 23:08 ` Matthias Andree
2006-03-02 23:20 ` Linus Torvalds
2006-03-03 0:02 ` Linus Torvalds
2006-03-03 0:12 ` Linus Torvalds
2006-03-03 16:43 ` Douglas Gilbert
2006-03-03 17:17 ` Linus Torvalds
2006-03-02 23:06 ` Matthias Andree
-- strict thread matches above, loose matches on Subject: below --
2006-03-02 23:04 Falkinder, David Malcolm
2006-03-02 23:04 ` Falkinder, David Malcolm
2006-03-03 20:24 Falkinder, David Malcolm
2006-03-03 21:54 ` Linus Torvalds
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