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<TITLE>sane-devel: SG_BIG_BUFF setting in Problems incorrect</TITLE>
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<META NAME="Author" CONTENT="Bill Wohler (wohler@newt.com)">
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<META NAME="Subject" CONTENT="SG_BIG_BUFF setting in Problems incorrect">
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<H1>SG_BIG_BUFF setting in Problems incorrect</H1>
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<!-- subject="SG_BIG_BUFF setting in Problems incorrect" -->
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<STRONG>From:</STRONG> Bill Wohler (<A HREF="mailto:wohler@newt.com?Subject=Re:%20SG_BIG_BUFF%20setting%20in%20Problems%20incorrect&In-Reply-To=<200002032239.OAA14015@gbr.newt.com>"><EM>wohler@newt.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Feb 03 2000 - 14:39:07 PST
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0031.html">Douglas Gilbert: "Re: SG_BIG_BUFF setting in Problems incorrect"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0031.html">Douglas Gilbert: "Re: SG_BIG_BUFF setting in Problems incorrect"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0035.html">abel deuring: "Re: SG_BIG_BUFF setting in Problems incorrect"</A>
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I just installed DEVEL_1_9 from the CVS repository and couldn't get
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<BR>
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to my scanner (HP Photosmart SCSI, running under a Linux 2.2.1
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<BR>
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kernel).
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<BR>
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<P> Thanks to the debugging output, the problem was clear:
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<BR>
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<BR>
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[wohler@gbr:587]% SANE_DEBUG_SANEI_SCSI=128 SANE_DEBUG_HP=128 scanimage
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<BR>
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...
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<BR>
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[sanei_scsi] sanei_scsi_open: could not allocate SG buffer memory wanted: 131072 got: 32768
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<BR>
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<P> The sane-scsi manpage suggested bumping SG_BIG_BUFF in
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<BR>
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/usr/src/linux/include/scsi/sg.h to 128*1024-512=130560 bytes, but
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<BR>
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this doesn't work. After bumping SG_BIG_BUFF to 128*1024=131072
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<BR>
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bytes, recompiling the kernel, rebooting, and recompiling sane, all
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<BR>
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was well (phew!). I would suggest updating the sane-scsi man page
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<BR>
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with the correct value to save others from an extra kernel compiling
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<BR>
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step.
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<BR>
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<P> Also, the Problems document mentions that newer kernels (>=2.2) can
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<BR>
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get the value from /proc/sys/kernel/sg-big-buff. I have 2.2.1 and
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<BR>
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this file is not present.
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<BR>
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<P> Note that the 1.0.1 snapshot was working previously although I had
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<BR>
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not updated the value of SG_BIG_BUFF.
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<BR>
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<P><PRE>
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--
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Bill Wohler <<A HREF="mailto:wohler@newt.com?Subject=Re:%20SG_BIG_BUFF%20setting%20in%20Problems%20incorrect&In-Reply-To=<200002032239.OAA14015@gbr.newt.com>">wohler@newt.com</A>>
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Say it with MIME. Maintainer of comp.mail.mh and news.software.nn FAQs.
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If you're passed on the right, you're in the wrong lane.
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<P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20SG_BIG_BUFF%20setting%20in%20Problems%20incorrect&In-Reply-To=<200002032239.OAA14015@gbr.newt.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0029.html">Oliver Rauch: "xsane-0.54 available"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0027.html">Wolfgang Rapp: "Re: fork or pthread for async I/O?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0031.html">Douglas Gilbert: "Re: SG_BIG_BUFF setting in Problems incorrect"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0031.html">Douglas Gilbert: "Re: SG_BIG_BUFF setting in Problems incorrect"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0035.html">abel deuring: "Re: SG_BIG_BUFF setting in Problems incorrect"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu Feb 03 2000 - 14:33:06 PST</EM>
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