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<!-- received="Sun Sep 7 04:24:55 1997 MST" -->
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<!-- sent="Sun, 7 Sep 1997 08:59:11 +0200 (MET DST)" -->
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<!-- name="Rogier Wolff" -->
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<!-- email="R.E.Wolff@BitWizard.nl" -->
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<!-- subject="Re: SANE and Mustek MFC-600S" -->
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<!-- id="199709070659.IAA00932@cave.BitWizard.nl" -->
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<!-- inreplyto="199709061820.LAA00666@hopper.mosberger" -->
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<title>sane-devel: Re: SANE and Mustek MFC-600S</title>
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<h1>Re: SANE and Mustek MFC-600S</h1>
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<b>Rogier Wolff</b> (<a href="mailto:R.E.Wolff@BitWizard.nl"><i>R.E.Wolff@BitWizard.nl</i></a>)<br>
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<i>Sun, 7 Sep 1997 08:59:11 +0200 (MET DST)</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#142">[ date ]</a><a href="index.html#142">[ thread ]</a><a href="subject.html#142">[ subject ]</a><a href="author.html#142">[ author ]</a>
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<li> <b>Next message:</b> <a href="0143.html">Rogier Wolff: "Re: Backtracking in color scanning"</a>
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<li> <b>Previous message:</b> <a href="0141.html">Rogier Wolff: "Re: Backtracking in color scanning"</a>
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<li> <b>In reply to:</b> <a href="0136.html">David Mosberger-Tang: "Re: SANE and Mustek MFC-600S"</a>
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<!-- nextthread="start" -->
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</ul>
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<!-- body="start" -->
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David Mosberger-Tang wrote:<br>
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<i>> </i><br>
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<i>> I don't know what exactly the Windows driver does (in fact, I have</i><br>
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<i>> never actually seen the Windows driver working since it doesn't work</i><br>
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<i>> on my Alpha box...). I discussed the issue with a Mustek engineer a</i><br>
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<i>> long time ago and he said backtracking for the MFC-06000CZ is</i><br>
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<i>> unavoidable at high resolutions (probably because it has an internal</i><br>
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<i>> buffer of 128KB only). If you're saying that the windows driver does</i><br>
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<i>> not backtrack even at 600dpi in color mode, then this is obviously not</i><br>
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<i>> the whole truth. It might be that using a larger kernel buffer (say</i><br>
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<i>> 1MB) might get rid of the backtracking completely, but it would at</i><br>
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<i>> least require some kernel hacking (also, I thought I read somewhere</i><br>
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<i>> that single SCSI transfers are limited to 128KB, am I</i><br>
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<i>> misremembering?).</i><br>
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<p>
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Yes, 1Mb SCSI transfers work just fine. The "strip-height" option that<br>
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you added due to my request was to prevent such a transfer to take the<br>
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bus for more than 10 seconds in a row.....<br>
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<p>
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I posted the patch to do this (the kernel hacking you mention :-) a few<br>
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days ago. Here it is again.<br>
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<p>
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Roger.<br>
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<p>
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-------------------------- sg_big_buf.patch ---------------------------<br>
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--- linux-2.0.28/include/scsi/sg.h Thu May 2 06:48:55 1996<br>
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+++ linux-2.0.28.posix6/include/scsi/sg.h Thu Jan 23 00:10:40 1997<br>
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@@ -36,6 +36,10 @@<br>
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#define SG_MAX_QUEUE 4 /* maximum outstanding request, arbitrary, may be<br>
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changed if sufficient DMA buffer room available */<br>
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<br>
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+#if 0<br>
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#define SG_BIG_BUFF 32768<br>
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+#else<br>
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+#define SG_BIG_BUFF 0x100000<br>
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+#endif<br>
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<br>
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#endif<br>
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--- linux-2.0.28/drivers/scsi/sg.c Sun Sep 1 08:15:33 1996<br>
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+++ linux-2.0.28.posix6/drivers/scsi/sg.c Thu Jan 23 00:12:52 1997<br>
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@@ -39,7 +39,11 @@<br>
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NULL, sg_attach, sg_detach};<br>
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<br>
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#ifdef SG_BIG_BUFF<br>
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+#if SG_BIG_BUFF < 0x10000<br>
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static char *big_buff = NULL;<br>
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+#else<br>
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+static char big_buff[SG_BIG_BUFF];<br>
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+#endif<br>
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static struct wait_queue *big_wait; /* wait for buffer available */<br>
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static int big_inuse=0;<br>
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#endif<br>
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@@ -565,8 +569,10 @@<br>
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#endif<br>
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<br>
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#ifdef SG_BIG_BUFF<br>
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+#if SG_BIG_BUFF < 0x10000<br>
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big_buff= (char *) scsi_init_malloc(SG_BIG_BUFF, GFP_ATOMIC | GFP_DMA);<br>
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#endif<br>
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+#endif<br>
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<br>
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scsi_generics = (struct scsi_generic *) <br>
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scsi_init_malloc((sg_template.dev_noticed + SG_EXTRA_DEVS) <br>
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@@ -648,8 +654,10 @@<br>
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}<br>
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sg_template.dev_max = 0;<br>
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#ifdef SG_BIG_BUFF<br>
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+#if SG_BIG_BUFF < 0x10000<br>
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if(big_buff != NULL)<br>
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scsi_init_free(big_buff, SG_BIG_BUFF);<br>
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+#endif<br>
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#endif<br>
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}<br>
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#endif /* MODULE */<br>
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<p>
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<p>
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<pre>
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--
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** <a href="mailto:R.E.Wolff@BitWizard.nl">R.E.Wolff@BitWizard.nl</a> ** +31-15-2137555 ** <a href="http://www.BitWizard.nl/">http://www.BitWizard.nl/</a> **
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Florida -- A 39 year old construction worker woke up this morning when a
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109-car freigt train drove over him. According to the police the man was
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drunk. The man himself claims he slipped while walking the dog. 080897
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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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/sane/</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="0143.html">Rogier Wolff: "Re: Backtracking in color scanning"</a>
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<li> <b>Previous message:</b> <a href="0141.html">Rogier Wolff: "Re: Backtracking in color scanning"</a>
|
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<li> <b>In reply to:</b> <a href="0136.html">David Mosberger-Tang: "Re: SANE and Mustek MFC-600S"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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