kopia lustrzana https://gitlab.com/sane-project/website
167 wiersze
6.5 KiB
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167 wiersze
6.5 KiB
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<TITLE>sane-devel: backtracking problem</TITLE>
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<H1>backtracking problem</H1>
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<!-- received="Thu Sep 21 02:40:52 2000" -->
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<!-- name="Ivo" -->
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<!-- id="20000921115141.A210@ancient.demon.nl" -->
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<STRONG>From:</STRONG> Ivo (<A HREF="mailto:death@metalfield.com?Subject=Re:%20backtracking%20problem&In-Reply-To=<20000921115141.A210@ancient.demon.nl>"><EM>death@metalfield.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Sep 21 2000 - 02:51:41 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0206.html">Wolfgang Cohrs: "sane on SPARC SOLARIS 8"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0204.html">Johan Bengtsson: "Re: Which scanner to buy?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0219.html">Henning Meier-Geinitz: "Re: backtracking problem"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0219.html">Henning Meier-Geinitz: "Re: backtracking problem"</A>
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<P>
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[about the ScanMagic 9636 S]
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<BR>
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<EM>> It's the same scanner, just a different name and slightly modified case. I
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</EM><BR>
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<EM>> think the ScanMagic is noname model from Mustek, at least there is no
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</EM><BR>
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<EM>> "Mustek" anywhere on the scanner.
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</EM><BR>
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<P>Right, the only way I knew this scanner was a Mustek was because I found
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<BR>
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out the ScanMagic scanner has support in the Mustek backend, and later because
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<BR>
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the sane frontends said it was a Mustek; there is not a single word "Mustek" to
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<BR>
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be found anywhere on the box or scanner.
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<BR>
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<P><EM>> Just to compare, that's the output from my Mustek ScanExpress 12000SP V 2.0.2:
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</EM><BR>
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<P>*nods* I see, exactly the same.
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<BR>
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<P><EM>> > I've managed to get the SCSI ISA card working with the g_NCR5380 driver
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</EM><BR>
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<EM>> > and ncr_addr=0x280 dtc_3181e=1 options. Scanning was very slow, so I
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</EM><BR>
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<EM>> > changed the USLEEP_SLEEP value to a minimum (1). I also changed
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</EM><BR>
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<EM>> > USLEEP_WAITLONG define to 1. Now the speed is bearable, but with color
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</EM><BR>
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<EM>> > scans, backtracking occurs.
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</EM><BR>
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<EM>> Independent from resolution settings and scan width?
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</EM><BR>
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<P>Well, now that you mention it, at low resolutions and small widths,
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<BR>
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backtracking does not seem to occur. But when I increase the scan width with
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<BR>
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the same resolution, it will happen. If I up the resolution with the same small
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<BR>
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width, backtracking also occurs; and scanning is very slow, but that could be
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<BR>
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normal, i.e. even so with the Windows driver (haven't tried).
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<BR>
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<P><EM>> > /usr/include/scsi/sg.h has been set to 130560 (prior to compiling SANE)
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</EM><BR>
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<EM>> This is not necessary for newer kernels.
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</EM><BR>
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<P>Right, but it can't hurt either, can it? :) Also, I have some SCSI host adapter
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<BR>
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emulation for CD writing which *may* profit from it, but I don't think so.
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<BR>
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<P><EM>> > and as you can see in the debug output, buffersize is increased to 1024
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</EM><BR>
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<EM>> > kb by the mustek backend.
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</EM><BR>
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<EM>> I don't think this will help with ScanExpress/ScanMagic scanners. They like
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</EM><BR>
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<EM>> their standard 64 K blocksize.
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</EM><BR>
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<P>But it won't have a negative effect either?
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<BR>
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<P><EM>> Just some data for comparison (everything in color mode):
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</EM><BR>
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...
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<BR>
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<EM>> I have done quite a lot of work to improve performance for the Mustek
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</EM><BR>
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<EM>> scanners. I hadn't much success concerning the ScanExpress Scanners in
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</EM><BR>
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<EM>> connection with the Mustek card, however. Meanwhile I think the problem
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</EM><BR>
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<EM>> isn't located in the Mustek backend but in the SCSI kernel driver. I have no
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</EM><BR>
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<EM>> experience with kernel programming so checking the driver has very low
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</EM><BR>
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<EM>> priority for me. Maybe someone else with more experience can look into the
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</EM><BR>
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<EM>> different "performance" of this SCSI adapter under Windows and Linux.
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</EM><BR>
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<P>I can believe it's the SCSI driver; it would be good fun to see performance of
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<BR>
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the Mustek SCSI ISA card as good as with the Windows driver, though. Somebody
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<BR>
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with kernel programming experience should mingle with the issue. :)
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<BR>
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<P><EM>> With an Adaptec 2940 or a NCR 810 clone the scanner is quite usable but not
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</EM><BR>
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<EM>> perfect.
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</EM><BR>
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<P>Well, with this dratted backtracking, it's still usable of course, but I know
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<BR>
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it can do better and that hurts. I might buy me another SCSI card someday to
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<BR>
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solve the problem if the SCSI driver doesn't get better then.
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<BR>
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<P>Ivo
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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:%20backtracking%20problem&In-Reply-To=<20000921115141.A210@ancient.demon.nl>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0206.html">Wolfgang Cohrs: "sane on SPARC SOLARIS 8"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0204.html">Johan Bengtsson: "Re: Which scanner to buy?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0219.html">Henning Meier-Geinitz: "Re: backtracking problem"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0219.html">Henning Meier-Geinitz: "Re: backtracking problem"</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>Thu Sep 21 2000 - 02:41:52 PDT</EM>
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