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<TITLE>sane-devel: Re: scsi command queuing</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (hmg-ml@gmx.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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<!-- name="Henning Meier-Geinitz" -->
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=<20000630202050.A7755@hmg1.vortex.swb.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Jun 30 2000 - 11:20:50 PDT
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<LI><STRONG>In reply to:</STRONG> <A HREF="0212.html">abel deuring: "Re: scsi command queuing"</A>
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Hi,
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<BR>
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<P>On Thu, Jun 29, 2000 at 02:14:25PM +0200, abel deuring wrote:
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<BR>
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<EM>> > Same here. I looked at the scanning times when the backend does nothing but
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</EM><BR>
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<EM>> > getting data from the scanner and ignoring it. There was no big change in
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</EM><BR>
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<EM>> > scanning time (about 5 %). With the original SCSI adapter the Mustek
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</EM><BR>
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<EM>> > scanners are about twice as slow as with Windows despite large (4 MB) SCSI
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</EM><BR>
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<EM>> > buffers and tweaking the Linux SCSI driver.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Which adapter is shipped with the Mustek? And do other adpaters work
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</EM><BR>
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<EM>> better?
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</EM><BR>
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<P>DTC-3181 or 53C400A. No interrupt (at least with Linux). The driver
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<BR>
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(g_NCR5380) blocks the whole system while waiting for a request. With some
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<BR>
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tricks (inserting usleeps) the driver is usable but gets slower. With the
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<BR>
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standard 128 MB SCSI buffer size scanning in high resolution is about 10
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<BR>
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times slower than with Windows because of backtracking after each read. With
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<BR>
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larger buffersizes I can go up to 2 times slower than windows.
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<BR>
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<P>With a different SCSI host adapter (Adaptec 2940 or NCR 810 clone) it's
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<BR>
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better and the scan performance is about the same as with Windows in most
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<BR>
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(but not all) situations.
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<BR>
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<P>I haven't checked yet what happens if I reserve a large SCSI buffer and
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<BR>
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enter small (32k or 64k) read requests.
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<BR>
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<P>Ciao,
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<BR>
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Henning
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<BR>
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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:%20scsi%20command%20queuing&In-Reply-To=<20000630202050.A7755@hmg1.vortex.swb.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0234.html">Henning Meier-Geinitz: "TODO for 1.0.3"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0232.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0212.html">abel deuring: "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>Fri Jun 30 2000 - 11:11:04 PDT</EM>
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