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<TITLE>sane-devel: Re: scsi command queuing</TITLE>
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<META NAME="Author" CONTENT="abel deuring (a.deuring@satzbau-gmbh.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="abel deuring" -->
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<!-- subject="Re: scsi command queuing" -->
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<!-- id="3960C1F6.C564F401@satzbau-gmbh.de" -->
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<STRONG>From:</STRONG> abel deuring (<A HREF="mailto:a.deuring@satzbau-gmbh.de?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=<3960C1F6.C564F401@satzbau-gmbh.de>"><EM>a.deuring@satzbau-gmbh.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Jul 03 2000 - 09:40:23 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0016.html">Dr. Ing. Dieter Jurzitza: "FW: AGGA SNAPSCAN / Polaroid Sprint Scan 35/LE"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0014.html">Avi Schwartz: "Bug report"</A>
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<HR NOSHADE><P>
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<P>
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Henning Meier-Geinitz wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> On Thu, Jun 29, 2000 at 02:14:25PM +0200, abel deuring wrote:
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</EM><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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<EM>>
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</EM><BR>
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<EM>> DTC-3181 or 53C400A. No interrupt (at least with Linux). The driver
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</EM><BR>
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<EM>> (g_NCR5380) blocks the whole system while waiting for a request. With some
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</EM><BR>
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<EM>> tricks (inserting usleeps) the driver is usable but gets slower. With the
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</EM><BR>
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<EM>> standard 128 MB SCSI buffer size scanning in high resolution is about 10
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</EM><BR>
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<EM>> times slower than with Windows because of backtracking after each read. With
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</EM><BR>
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<EM>> larger buffersizes I can go up to 2 times slower than windows.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> With a different SCSI host adapter (Adaptec 2940 or NCR 810 clone) it's
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</EM><BR>
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<EM>> better and the scan performance is about the same as with Windows in most
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</EM><BR>
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<EM>> (but not all) situations.
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</EM><BR>
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<P>Henning,
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<BR>
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<P>I think this simply shows that a SCSI adapter or driver, which don't
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<BR>
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support interrupts or DMA, are not very suitable for a real multitasking
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<BR>
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OS like Linux. I even don't expect that it is possible under Windows to
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<BR>
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really run another program while such a cheap SCSI adapter is working.
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<BR>
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<P>Abel
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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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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0016.html">Dr. Ing. Dieter Jurzitza: "FW: AGGA SNAPSCAN / Polaroid Sprint Scan 35/LE"</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>Mon Jul 03 2000 - 09:29:07 PDT</EM>
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