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<TITLE>sane-devel: Re: scsi command queuing</TITLE>
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<META NAME="Author" CONTENT="Wolfgang Rapp (wolfgang@rapp-informatik.de)">
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<META NAME="Subject" CONTENT="Re: scsi command queuing">
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<H1>Re: scsi command queuing</H1>
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<!-- received="Thu Jun 29 10:46:08 2000" -->
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<!-- sent="Thu, 29 Jun 2000 20:58:58 +0200" -->
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<!-- name="Wolfgang Rapp" -->
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<!-- email="wolfgang@rapp-informatik.de" -->
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<!-- subject="Re: scsi command queuing" -->
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<!-- id="395B9C72.12C0D2D7@rapp-informatik.de" -->
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<!-- inreplyto="395A7A9F.DEB273C1@wolfsburg.de" -->
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<STRONG>From:</STRONG> Wolfgang Rapp (<A HREF="mailto:wolfgang@rapp-informatik.de?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=<395B9C72.12C0D2D7@rapp-informatik.de>"><EM>wolfgang@rapp-informatik.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Jun 29 2000 - 11:58:58 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0218.html">spam@theverge.com: "off topic, canon 630u"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0216.html">Oliver Rauch: "Re: scsi command queuing"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0208.html">Oliver Rauch: "Re: scsi command queuing"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0221.html">Douglas Gilbert: "Re: scsi command queuing"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0205.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0221.html">Douglas Gilbert: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0227.html">Oliver Rauch: "Re: scsi command queuing"</A>
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<P>
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Oliver Rauch schrieb:
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<BR>
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<P><EM>> if I do not send the image data from the reader_process to the main process
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</EM><BR>
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<EM>> (only send read commands to the scsi bus) the scanning speed is not increased.
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</EM><BR>
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<EM>> So I also think it is a problem between sanei_scsi, the sg driver and the kernel
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</EM><BR>
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<EM>> lowlevel scsi driver. In sanei_scsi there also is a not really necessary memcpy
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</EM><BR>
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<EM>> command but I do not think that this command does make the problem.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> A bit strange is that it does not make any differences if I use 32 KB or 256KB
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</EM><BR>
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<EM>> for the read command buffer (The scanner has 256KB internal image data).
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Moin Oliver
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<BR>
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Yes this shows that the scan commands must be send very fast to have no
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<BR>
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stops - because the firmare of the scanners have the same quality as the
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<BR>
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system this hardware is designed to work with ->GatesWare.
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<BR>
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<P>On my old UW driver I use maximum 16K data blocks and no stops with Scanmaker II
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<BR>
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on a 60 Mz Pentium up to 300 dpi 24 bit A4 scans.
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<BR>
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BTW it seems to make problems in DMA transfer if the buffer goes over DMA
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<BR>
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bounderies
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<BR>
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depending on the ugly PC hardware design. So what do the low level drivers with a
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<BR>
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256KB buffer.
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<BR>
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<P>Bye Wolfgang
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<BR>
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<P><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:%20scsi%20command%20queuing&In-Reply-To=<395B9C72.12C0D2D7@rapp-informatik.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0218.html">spam@theverge.com: "off topic, canon 630u"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0216.html">Oliver Rauch: "Re: scsi command queuing"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0208.html">Oliver Rauch: "Re: scsi command queuing"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0221.html">Douglas Gilbert: "Re: scsi command queuing"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0205.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0221.html">Douglas Gilbert: "Re: scsi command queuing"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0227.html">Oliver Rauch: "Re: scsi command queuing"</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 Jun 29 2000 - 10:48:00 PDT</EM>
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