From: Mike Anderson <andmike@us.ibm.com>
To: Haofeng Kou <haofengk@ptu.promise.com>
Cc: linux-scsi@vger.kernel.org
Subject: Re: SCSI Command scatter-gather number
Date: Tue, 30 Jul 2002 14:43:26 -0700 [thread overview]
Message-ID: <20020730144326.A26330@beaverton.ibm.com> (raw)
In-Reply-To: <F6A3AFC9BCD92E48B79C14E4AAAEA20F45A678@nonamea.ptu.promise.com>; from haofengk@ptu.promise.com on Tue, Jul 30, 2002 at 02:07:49PM -0700
On 2.4 the use_sg value should be limited to the smaller of MAX_SEGMENTS
or the scsi host sg_tablesize.
This is checked in the block interface during __make_request. I believe if
you got through the sg interface the limiting value is only sg_tablesize,
but Doug is the best one to answer that.
-Mike
Haofeng Kou [haofengk@ptu.promise.com] wrote:
> For the "struct scsi_cmnd", there is a member :
> unsigned short use_sg;
> Which gives the Number of pieces of the scatter-gather.
>
> How to limit its value, how to set the max value for the "use_sg"?
>
>
> Thanks,
> -
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--
Michael Anderson
andmike@us.ibm.com
next prev parent reply other threads:[~2002-07-30 21:43 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-30 21:07 SCSI Command scatter-gather number Haofeng Kou
2002-07-30 21:33 ` Kurt Garloff
2002-07-30 21:43 ` Mike Anderson [this message]
2002-07-31 3:22 ` Douglas Gilbert
2002-07-31 5:11 ` Doug Ledford
2002-07-31 5:26 ` Matthew Jacob
2002-07-31 7:44 ` Jeremy Higdon
2002-07-31 13:36 ` Doug Ledford
2002-08-01 1:16 ` Jeremy Higdon
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