sane-project-website/old-archive/1999-11/0254.html

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<title>sane-devel: Re: no SG__BIG_BUF in kernel 2.2.12</title>
<h1>Re: no SG__BIG_BUF in kernel 2.2.12</h1>
<b>Douglas Gilbert</b> (<a href="mailto:dgilbert@interlog.com"><i>dgilbert@interlog.com</i></a>)<br>
<i>Thu, 25 Nov 1999 23:09:07 -0500</i>
<p>
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joakim verona wrote:<br>
<i>&gt; </i><br>
<i>&gt; I've been trying now and then for some time to get my snapscan 300 to</i><br>
<i>&gt; work.</i><br>
<i>&gt; with the latest developer snapshot i had partial success, i could at</i><br>
<i>&gt; least do a preview scan with xscanimage, but when i try to do a full</i><br>
<i>&gt; scan it hangs after scanning a fraction of the image.</i><br>
<i>&gt; </i><br>
<i>&gt; so i've read some of the advice on the list and was going to try to</i><br>
<i>&gt; increase the SG_BIG_BUF parameter in sg.h. But there seems to be no such</i><br>
<i>&gt; parameter in kernel 2.2.12!</i><br>
<i>&gt; </i><br>
<i>&gt; is SG_BIG_BUF still applicable, or what?</i><br>
<p>
According to the Linux Cross Reference (site lxr.linux.no) in<br>
Linux kernel 2.2.12 in /usr/src/linux/include/scsi/sg.h<br>
on line 231 is:<br>
#define SG_BIG_BUFF SG_DEF_RESERVED_SIZE<br>
<p>
Note the different spelling. Backing up to line 226 is:<br>
#define SG_DEF_RESERVED_SIZE SG_SCATTER_SZ<br>
<p>
Now assuming you have a reasonable SCSI controller then you<br>
can try changing that to:<br>
#define SG_DEF_RESERVED_SIZE (SG_SCATTER_SZ * 4)<br>
<p>
and then build the the sg driver into the kernel. This way<br>
if SANE reads /proc/sys/kernel/sg-big-buff it will find<br>
131072. [If you build sg as a module that file is not<br>
there and I think SANE assumes a buffer size of 32768.]<br>
<p>
Next, if you haven't already, go to Kevin Charter's web<br>
site (see recent newsgroup postings by him) and get a<br>
new Snapscan backend.<br>
<p>
Before you rebuild SANE, try:<br>
diff /usr/src/linux/include/scsi/sg.h /usr/include/scsi/sg.h<br>
<p>
If they are different then:<br>
cp /usr/src/linux/include/scsi/sg.h /usr/include/scsi/sg.h<br>
[This glitch is brought to you by glibc library maintainers.]<br>
<p>
See if that makes a difference.<br>
<p>
Doug Gilbert<br>
<p>
<pre>
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</pre>
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<li> <b>Next message:</b> <a href="0255.html">Russ Burdick: "Re: Acer 310s?"</a>
<li> <b>Previous message:</b> <a href="0253.html">Brian Beattie: "decoding image formats"</a>
<li> <b>Maybe in reply to:</b> <a href="0245.html">joakim verona: "no SG__BIG_BUF in kernel 2.2.12"</a>
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<li> <b>Next in thread:</b> <a href="0257.html">joakim verona: "Re: no SG__BIG_BUF in kernel 2.2.12"</a>
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