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94 wiersze
4.1 KiB
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<!-- received="Thu Jun 3 09:02:10 1999 PDT" -->
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<!-- sent="Thu, 03 Jun 1999 17:57:32 +0200" -->
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<!-- name="Nemeth Laszlo" -->
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<!-- email="nemeth@qwertynet.hu" -->
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<!-- subject="Re: Mustek ScanExpress 12000SP slow" -->
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<!-- inreplyto="Mustek ScanExpress 12000SP slow" -->
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<title>sane-devel: Re: Mustek ScanExpress 12000SP slow</title>
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<h1>Re: Mustek ScanExpress 12000SP slow</h1>
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<b>Nemeth Laszlo</b> (<a href="mailto:nemeth@qwertynet.hu"><i>nemeth@qwertynet.hu</i></a>)<br>
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<i>Thu, 03 Jun 1999 17:57:32 +0200</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#18">[ date ]</a><a href="index.html#18">[ thread ]</a><a href="subject.html#18">[ subject ]</a><a href="author.html#18">[ author ]</a>
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<li> <b>Next message:</b> <a href="0019.html">Dr. Andreas Bolsch: "Re: Mustek ScanExpress 12000SP slow"</a>
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<li> <b>Previous message:</b> <a href="0017.html">Nemeth Laszlo: "Re: Mustek ScanExpress 12000SP slow"</a>
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</ul>
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<i>> "Gilbert, Douglas" wrote:</i><br>
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<i>> </i><br>
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<i>> Nemeth,</i><br>
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<i>> </i><br>
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<i>> > Also modified /usr/include/scsi/sg.h to</i><br>
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<i>> > #define SG_SCATTER_SZ (32 * 4096)</i><br>
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<i>> > (this seems to be the new name for SG_BIG_BUFF</i><br>
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<i>> > in kernel 2.2.9 I'm using)</i><br>
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<i>> </i><br>
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<i>> This won't help. It will only make things worse.</i><br>
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<i>> You should leave SG_SCATTER_SZ at 32KB (8 * 4096)</i><br>
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<i>> and try and bump SG_BIG_BUFF up:</i><br>
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<i>> </i><br>
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<i>> #define SG_BIG_BUFF (SG_SCATTER_SZ * 4)</i><br>
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<p>
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This was the first thing I tried, but SANE (after recompiling) still<br>
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transerred 32k blocks only. Then I found this comment below<br>
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SG_SCATTER_SZ:<br>
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<p>
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"If scatter-gather not supported by adapter then this value is the<br>
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largest data block that can be read/written by a single scsi command."<br>
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<p>
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So it seems the DTC3181 doesn't support scatter-gather. After bumping<br>
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the SG_SCATTER_SZ value, SANE transferred 64k blocks (the maximum for my<br>
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scanner).<br>
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Well, this thing doesn't appear to be a normal SCSI adapter.....<br>
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<p>
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<i>> Then recompile SANE. None of this will probably help</i><br>
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<i>> you ... the DTC3181 is most likely causing the problem.</i><br>
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<i>> Do you have any other SCSI devices (a disk, for</i><br>
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<i>> example)? If so you could use some of my utilities</i><br>
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<i>> to test the throughput of the DTC card.</i><br>
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<p>
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Unfortunately I have no spare SCSI devices I could test the throughput<br>
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with. I guess it'd be very low. In the meantime I found a temporary<br>
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solution for speeding things up, with disabling the USLEEP option of the<br>
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DTC driver. This is OK, I think, since there are no other devices<br>
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attached to the card, so the fact that the scanner doesn't properly<br>
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disconnect itself from the bus won't cause any problems.<br>
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Now it's still not at the speed that it can do in windoze, but already<br>
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acceptable, and doesn't freeze the system while scanning, like in that<br>
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other os.<br>
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<p>
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I think I'll pick up a cheap NCR53c810 card for the scanner, and dump<br>
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the DTC soon.<br>
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<p>
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<i>> P.S. I would like to email this back to the SANE</i><br>
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<i>> newsgroup but can find no way looking at the archive.</i><br>
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<i>> Do you know the newsgroup (or reflector) address.</i><br>
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<i>> {I don't want to subscribe, my email box is already</i><br>
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<i>> overflowing).</i><br>
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<p>
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Cc'd to the list, hope you don't mind. I don't know anything about the<br>
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news mirror of the list.<br>
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<p>
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Thank you,<br>
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Laszlo<br>
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<p>
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<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">majordomo@mostang.com</a>
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</pre>
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0019.html">Dr. Andreas Bolsch: "Re: Mustek ScanExpress 12000SP slow"</a>
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<li> <b>Previous message:</b> <a href="0017.html">Nemeth Laszlo: "Re: Mustek ScanExpress 12000SP slow"</a>
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<!-- nextthread="start" -->
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</ul>
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