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<TITLE>sane-devel: scsi command queuing</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="scsi command queuing">
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<H1>scsi command queuing</H1>
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<!-- name="Oliver Rauch" -->
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<!-- subject="scsi command queuing" -->
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<!-- id="395A191F.E569B9AE@wolfsburg.de" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=<395A191F.E569B9AE@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Jun 28 2000 - 08:26:23 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0202.html">Wolfgang Rapp: "Re: scsi command queuing"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0200.html">Petter Reinholdtsen: "Test backends with 'scanimage -T'"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0202.html">Wolfgang Rapp: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0202.html">Wolfgang Rapp: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0205.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0212.html">abel deuring: "Re: scsi command queuing"</A>
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<P>
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Hi,
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<BR>
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<P>has someone experience with a sane backend and scsi command queueing?
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<BR>
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<P>I am just working on it for the umax backend.
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<BR>
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<P>At first I created some routines that replace the pipe to transfer the
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<BR>
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data from the reader_process to the main process, it uses shared memory
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<BR>
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instead (on systems where shared memory is available, otherwise the pipe is
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<BR>
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used).
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<BR>
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<P>Unfortunetly it does not speed up scanning large images. It really looks like
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<BR>
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the comunication via the scsi bus is not fast enough.
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<BR>
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<P>So I added scsi command queueing into the umax backend. But I am not
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<BR>
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sure how I can see
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<BR>
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1) how/if it works (sanei_scsi debug output is not good enough)
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<BR>
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2) what I can do to speed up the comunication (it also does not help a lot).
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<BR>
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<P>Any help is appreciated
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<P><PRE>
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--
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Homepage: <A HREF="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</A>
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sane-umax: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-umax.html">http://www.wolfsburg.de/~rauch/sane/sane-umax.html</A>
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xsane: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@Wolfsburg.DE?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=<395A191F.E569B9AE@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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<P><P><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:%20scsi%20command%20queuing&In-Reply-To=<395A191F.E569B9AE@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0202.html">Wolfgang Rapp: "Re: scsi command queuing"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0200.html">Petter Reinholdtsen: "Test backends with 'scanimage -T'"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0202.html">Wolfgang Rapp: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0202.html">Wolfgang Rapp: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0205.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0212.html">abel deuring: "Re: scsi command queuing"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Wed Jun 28 2000 - 08:14:38 PDT</EM>
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