sane-project-website/old-archive/2000-06/0232.html

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<TITLE>sane-devel: Re: scsi command queuing</TITLE>
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<H1>Re: scsi command queuing</H1>
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=&lt;20000630195917.B7623@hmg1.vortex.swb.de&gt;"><EM>hmg-ml@gmx.de</EM></A>)<BR>
<STRONG>Date:</STRONG> Fri Jun 30 2000 - 10:59:17 PDT
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Hi,
<BR>
<P>On Thu, Jun 29, 2000 at 12:13:23AM +0200, Oliver Rauch wrote:
<BR>
<EM>&gt; Henning Meier-Geinitz wrote:
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; &gt; Same here. I looked at the scanning times when the backend does nothing but
</EM><BR>
<EM>&gt; &gt; getting data from the scanner and ignoring it. There was no big change in
</EM><BR>
<EM>&gt; &gt; scanning time (about 5 %). With the original SCSI adapter the Mustek
</EM><BR>
<EM>&gt; &gt; scanners are about twice as slow as with Windows despite large (4 MB) SCSI
</EM><BR>
<EM>&gt; &gt; buffers and tweaking the Linux SCSI driver.
</EM><BR>
<EM>&gt;
</EM><BR>
<EM>&gt; 4 MB images are not the problem of the umax backend.
</EM><BR>
<P>I am not talking about image size but about SCSI buffer size. With most
<BR>
Mustek scanners and the Mustek SCSI adapters the scan stops after each read
<BR>
command and backtracking occurs. So I am trying to scan with large buffers.
<BR>
Standard is 1 MB at the moment. The scan speed is dependant from the
<BR>
resolution and image with (but not from length).
<BR>
<P>Bye,
<BR>
&nbsp;&nbsp;Henning
<BR>
<P><PRE>
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