[7096] in linux-scsi channel archive
Re: scsi driver transfer size and sync mode
daemon@ATHENA.MIT.EDU (Tony Chung)
Wed Sep 1 15:43:11 1999
Date: Wed, 01 Sep 1999 12:14:36 -0700
From: Tony Chung <chungto@ampex.com>
To: Kai.Makisara@metla.fi
CC: linux-scsi@vger.rutgers.edu
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Kai Makisara wrote:
> On Wed, 25 Aug 1999, Tony Chung wrote:
>
> >
> > 1. Can Linux support single scsi transfer of at least 1040384 bytes?
>
> Yes. I have written tape blocks of at least 1.5 MB.
>
>
Can you give me some pointers on how this can be done?
From the source tree of 2.2.12, I will modify:
AIC7XXX_MAX_SG to 254 in drivers/scsi/aic7xxx.c
And I will modify st:buffer_kbs to be 1016 (i.e. 254*4*1024 bytes)
and st:max_sg_segs to 254 also.
bash# /sbin/modinfo -p st
buffer_kbs int
write_threshold_kbs int
max_buffers int
max_sg_segs int
I believe you can set them through /etc/modules.conf.
Is there a way to find out the current parameters values?
Please correct me if this is not the right direction.
Thanks.
--
=============================
Tony Chung
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Kai Makisara wrote:
<blockquote TYPE=CITE>On Wed, 25 Aug 1999, Tony Chung wrote:
<p>>
<br>> 1. Can Linux support single scsi transfer of at least
1040384 bytes?
<p>Yes. I have written tape blocks of at least 1.5 MB.
<br>
<br> </blockquote>
Can you give me some pointers on how this can be done?
<p>From the source tree of 2.2.12, I will modify:
<p>AIC7XXX_MAX_SG to 254 in drivers/scsi/aic7xxx.c
<p>And I will modify st:buffer_kbs to be 1016 (i.e. 254*4*1024 bytes)
<br>and st:max_sg_segs to 254 also.
<p>bash# /sbin/modinfo -p st
<br>buffer_kbs int
<br>write_threshold_kbs int
<br>max_buffers int
<br>max_sg_segs int
<p>I believe you can set them through /etc/modules.conf.
<br>Is there a way to find out the current parameters values?
<br>Please correct me if this is not the right direction.
<br>Thanks.
<br>
<pre>--
=============================
Tony Chung</pre>
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