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<TITLE>sane-devel: [PATCH] sanei_scsi.c for dio in Linux</TITLE>
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<META NAME="Author" CONTENT="Douglas Gilbert (dgilbert@interlog.com)">
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<META NAME="Subject" CONTENT="[PATCH] sanei_scsi.c for dio in Linux">
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<H1>[PATCH] sanei_scsi.c for dio in Linux</H1>
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<!-- received="Sun Apr 1 08:49:12 2001" -->
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<!-- name="Douglas Gilbert" -->
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<!-- subject="[PATCH] sanei_scsi.c for dio in Linux" -->
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<!-- id="3AC74294.E93856C5@interlog.com" -->
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20[PATCH]%20sanei_scsi.c%20for%20dio%20in%20Linux&In-Reply-To=<3AC74294.E93856C5@interlog.com>"><EM>dgilbert@interlog.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Apr 01 2001 - 08:00:36 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0003.html">Ulrich Hopp: "Mustek 1200 SP Pro + aha152x + linux 2.4.3 = success"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0001.html">Douglas Gilbert: "Re: SuSE 7.1 backends compile"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0007.html">Tim Waugh: "Re: [PATCH] sanei_scsi.c for dio in Linux"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0007.html">Tim Waugh: "Re: [PATCH] sanei_scsi.c for dio in Linux"</A>
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<P>
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Together with Abel Deuring I have been doing some testing
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<BR>
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using "direct IO" to speed data transfers with SANE when
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<BR>
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using lk 2.4 kernels. Abel has had the code in place for
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<BR>
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a while (both in 1.0.3 and 1.0.4) but it hasn't yet been
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<BR>
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used in "anger". Anyway I found a small problem and have
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<BR>
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been unable to contact Abel. Since I don't have CVS access
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<BR>
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perhaps someone could apply the patch below.
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<BR>
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<P>--- sane-backends-1.0.4/sanei/sanei_scsi.c Thu Nov 30 15:02:30 2000
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<BR>
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+++ sane-backends-1.0.4/sanei/sanei_scsi.c_dio Sun Apr 1 10:38:55 2001
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<BR>
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@@ -2022,7 +2022,7 @@
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<BR>
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else
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<BR>
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{
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<BR>
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/* check for errors, but let the sense_handler decide.... */
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<BR>
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- if ( (req->sgdata.sg3.hdr.info && SG_INFO_CHECK != 0)
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<BR>
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+ if ( (req->sgdata.sg3.hdr.info & SG_INFO_CHECK != 0)
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<BR>
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|| (req->sgdata.sg3.hdr.sb_len_wr > 0 &&
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<BR>
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((req->sgdata.sg3.sense_buffer[0] & 0x7f) != 0)))
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<BR>
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<P><P>For any adventurous people who have a fast scsi scanner and
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<BR>
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are running lk 2.4 then to test this you will need to get
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<BR>
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sg version 3.1.18 (at <A HREF="http://www.torque.net/sg">http://www.torque.net/sg</A> ), apply
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<BR>
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the above patch and rebuild SANE. First try a scan to make
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<BR>
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sure everything is still working. Then do
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<BR>
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"echo 1 > /proc/scsi/sg/allow_dio" and try to scan again.
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<BR>
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It works for me, but given the data transfer speed of my
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<BR>
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UMAX 1220S, it is hardly likely to make a measurable
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<BR>
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performance impact. I would be interested in reports.
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<BR>
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<P>Doug Gilbert
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<BR>
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<P><PRE>
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--
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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:%20[PATCH]%20sanei_scsi.c%20for%20dio%20in%20Linux&In-Reply-To=<3AC74294.E93856C5@interlog.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0003.html">Ulrich Hopp: "Mustek 1200 SP Pro + aha152x + linux 2.4.3 = success"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0007.html">Tim Waugh: "Re: [PATCH] sanei_scsi.c for dio in Linux"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Apr 01 2001 - 08:50:45 PDT</EM>
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