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<!-- received="Sat Apr 10 20:18:32 1999 PDT" -->
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<!-- sent="Sat, 10 Apr 1999 23:20:02 -0400 (EDT)" -->
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<!-- name="Larry Snyder" -->
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<!-- email="larrys@lexis-nexis.com" -->
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<!-- subject="Re: Relisys Backend devel snags -- lockup when scanner buffer fills" -->
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<!-- id="199904110320.XAA07743@ra.lexis-nexis.com" -->
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<!-- inreplyto="Pine.LNX.4.10.9904101855170.5139-100000@arakis.martica.org" -->
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<title>sane-devel: Re: Relisys Backend devel snags -- lockup when scanner buffer fills</title>
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<h1>Re: Relisys Backend devel snags -- lockup when scanner buffer fills</h1>
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<b>Larry Snyder</b> (<a href="mailto:larrys@lexis-nexis.com"><i>larrys@lexis-nexis.com</i></a>)<br>
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<i>Sat, 10 Apr 1999 23:20:02 -0400 (EDT)</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#174">[ date ]</a><a href="index.html#174">[ thread ]</a><a href="subject.html#174">[ subject ]</a><a href="author.html#174">[ author ]</a>
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<li> <b>Next message:</b> <a href="0175.html">martica@martica.org: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Previous message:</b> <a href="0173.html">martica@martica.org: "Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Next in thread:</b> <a href="0175.html">martica@martica.org: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Reply:</b> <a href="0175.html">martica@martica.org: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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</ul>
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Hi Tyler --<br>
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Just curious -- do you have 'disconnect' enabled in your scsi driver<br>
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in the kernel?<br>
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Just a thought...<br>
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-ls-<br>
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<p>
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<p>
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<a href="mailto:martica@martica.org">martica@martica.org</a> wrote:<br>
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<i>> Howdy all,</i><br>
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<i>> </i><br>
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<i>> I've been working on the backend for the Relisys/Teco lines, and have</i><br>
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<i>> got things working pretty darn good for 24bit color scans at low</i><br>
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<i>> resolutions.</i><br>
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<i>> </i><br>
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<i>> PROBLEM: Scanner pauses scanning when buffer fills and machine locks</i><br>
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<i>> after almost emptying the buffer.</i><br>
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<i>> </i><br>
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<i>> I've run into some sort of problem, which I think is somehow scsi</i><br>
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<i>> related. When I scan at a high resolution the scanners internal buffer</i><br>
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<i>> fills faster than I can read the data out of it. I could try to increase</i><br>
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<i>> the sg buffer size, but I don't think that that is really a solution and</i><br>
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<i>> the problem will still exist with high res scans of the entire flatbed</i><br>
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<i>> area. </i><br>
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<i>> </i><br>
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<i>> When scanner under the Windows twain driver the scanner will pause</i><br>
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<i>> scanning when its buffer fills and restart when it empties again. This</i><br>
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<i>> seems to happen under linux, but the restart never occurs. When my</i><br>
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<i>> backend reads the second last 32k chunk from the scanner the entire</i><br>
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<i>> machine locks up and I have to shutdown the scanner to have it continue. </i><br>
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<i>> </i><br>
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<i>> I have to admit that this is my first foray into interfaceing with the</i><br>
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<i>> scsi subsystem, and have some hope that one of you scsi/scanner gurus</i><br>
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<i>> might have a clue to impart to me on possible reasons for this behavior.</i><br>
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<i>> </i><br>
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<i>> Thanks for your time,</i><br>
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<i>> Tyler Bindon</i><br>
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<i>> <a href="mailto:martica@martica.org">martica@martica.org</a></i><br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> Sample Scan Output for your perusal:</i><br>
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<i>> </i><br>
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<i>> % scanimage -x 200 -y 120 --resolution=300 > test.pnm</i><br>
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<i>> .</i><br>
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<i>> . many many many lines ommited</i><br>
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<i>> .</i><br>
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<i>> reader: waiting for data.[sanei_scsi] scsi_req_enter: entered 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi.issue: 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: read 54 bytes</i><br>
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<i>> [relisys] avail = 181797</i><br>
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<i>> ! 181797 bytes available.</i><br>
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<i>> reader: About to read 32000 bytes, [sanei_scsi] scsi_req_enter: entered</i><br>
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<i>> 0x807ec1</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi.issue: 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: read 32036 bytes</i><br>
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<i>> Successful.</i><br>
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<i>> Outputting 32000 bytes to fd,</i><br>
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<i>> reader: waiting for data.[sanei_scsi] scsi_req_enter: entered 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi.issue: 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: read 54 bytes</i><br>
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<i>> [relisys] avail = 151104</i><br>
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<i>> ! 151104 bytes available.</i><br>
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<i>> reader: About to read 32000 bytes, [sanei_scsi] scsi_req_enter: entered</i><br>
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<i>> 0x807ec1</i><br>
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<i>> [sanei_scsi] sanei_scsi_req_wait: waiting for 0x807ec10</i><br>
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<i>> [sanei_scsi] sanei_scsi.issue: 0x807ec10</i><br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> --</i><br>
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<i>> Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a></i><br>
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<i>> To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a></i><br>
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<p>
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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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<!-- body="end" -->
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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="0175.html">martica@martica.org: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Previous message:</b> <a href="0173.html">martica@martica.org: "Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0175.html">martica@martica.org: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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<li> <b>Reply:</b> <a href="0175.html">martica@martica.org: "Re: Relisys Backend devel snags -- lockup when scanner buffer fills"</a>
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</ul>
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