From: Jeremy Higdon <jeremy@sgi.com>
To: Andrew Vasquez <andrew.vasquez@qlogic.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>,
Jeff Garzik <jgarzik@pobox.com>,
Anton Blanchard <anton@samba.org>, Jens Axboe <axboe@suse.de>,
SCSI Mailing List <linux-scsi@vger.kernel.org>
Subject: Re: PATCH [5/15] qla2xxx: SG tablesize update
Date: Mon, 15 Mar 2004 22:40:37 -0800 [thread overview]
Message-ID: <20040316064037.GA618317@sgi.com> (raw)
In-Reply-To: <B179AE41C1147041AA1121F44614F0B0598FC6@AVEXCH02.qlogic.org>
On Mon, Mar 15, 2004 at 03:43:18PM -0800, Andrew Vasquez wrote:
>
> Since the driver specifies SG_ALL for the sg_tablesize, from testing
> (x86 and ppc64), we've seen at most 128 SG entries attached to a
> command request of 512K bytes (4K page size * 128).
Andrew, with a slight mod to your driver, and using James's patch
to issue larger requests, I was able to issue 4MB requests to a
device (256 SG entries times 16KB page size) on our Itanium box.
Some H/W RAIDs have a strong preference for really large requests.
Your plan to switch to the midlayer throttling mechanism sounds good.
jeremy
next prev parent reply other threads:[~2004-03-16 21:09 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-15 23:43 PATCH [5/15] qla2xxx: SG tablesize update Andrew Vasquez
2004-03-16 3:37 ` James Bottomley
2004-03-16 6:40 ` Jeremy Higdon [this message]
2004-03-16 11:32 ` Anton Blanchard
2004-03-16 21:49 ` James Bottomley
-- strict thread matches above, loose matches on Subject: below --
2004-03-16 22:09 Andrew Vasquez
2004-03-14 8:24 Andrew Vasquez
2004-03-14 14:49 ` James Bottomley
2004-03-14 14:51 ` Jens Axboe
2004-03-14 14:59 ` James Bottomley
2004-03-14 15:15 ` Jens Axboe
2004-03-14 15:18 ` Anton Blanchard
2004-03-14 15:31 ` James Bottomley
2004-03-14 15:47 ` Anton Blanchard
2004-03-14 15:55 ` James Bottomley
2004-03-14 16:01 ` Anton Blanchard
2004-03-14 20:41 ` Jeff Garzik
2004-03-14 22:27 ` James Bottomley
2004-03-15 16:12 ` Jeff Garzik
2004-03-14 20:36 ` Jeff Garzik
2004-03-14 22:31 ` James Bottomley
2004-03-15 16:09 ` Jeff Garzik
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