From: James Bottomley <James.Bottomley@SteelEye.com>
To: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: linux1394-devel@lists.sourceforge.net, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] ieee1394: sbp2: lower block queue alignment requirement
Date: Sun, 14 Jan 2007 13:19:47 -0600 [thread overview]
Message-ID: <1168802387.2780.1.camel@mulgrave.il.steeleye.com> (raw)
In-Reply-To: <tkrat.37326df2d568d12d@s5r6.in-berlin.de>
On Sun, 2007-01-14 at 19:45 +0100, Stefan Richter wrote:
> I wonder, do we need this call to blk_queue_dma_alignment() at all?
> Does the block layer perhaps provide sufficient alignment guarantees?
The block layer currently provides sector (512) byte alignment
guarantees. However, there has been talk in SCSI of reducing that to
word (4) since that's what most intelligent PCI controllers can cope
with. If you have any alignment constraints, they should be expressed
in the slave configure.
James
next prev parent reply other threads:[~2007-01-14 19:19 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-14 18:45 [PATCH] ieee1394: sbp2: lower block queue alignment requirement Stefan Richter
2007-01-14 19:19 ` James Bottomley [this message]
2007-01-14 20:14 ` Stefan Richter
2007-01-15 19:39 ` Kristian Høgsberg
2007-01-15 19:50 ` Mike Christie
2007-01-15 20:02 ` Stefan Richter
2007-01-15 21:24 ` James Bottomley
2007-01-25 21:35 ` Stefan Richter
2007-02-04 12:04 ` [PATCH] ieee1394: sbp2: remove unnecessary alignments of struct members Stefan Richter
2007-02-04 12:05 ` [PATCH] ieee1394: sbp2: enforce 32bit DMA mapping Stefan Richter
2007-02-04 16:06 ` David Moore
2007-02-04 19:25 ` Stefan Richter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1168802387.2780.1.camel@mulgrave.il.steeleye.com \
--to=james.bottomley@steeleye.com \
--cc=linux-scsi@vger.kernel.org \
--cc=linux1394-devel@lists.sourceforge.net \
--cc=stefanr@s5r6.in-berlin.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox