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<TITLE>sane-devel: Re: scsi command queuing</TITLE>
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<META NAME="Author" CONTENT="Douglas Gilbert (dgilbert@interlog.com)">
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<META NAME="Subject" CONTENT="Re: scsi command queuing">
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<H1>Re: scsi command queuing</H1>
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20scsi%20command%20queuing&In-Reply-To=<395D3ABC.E907A0CB@interlog.com>"><EM>dgilbert@interlog.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Jun 30 2000 - 17:26:36 PDT
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<LI><STRONG>Previous message:</STRONG> <A HREF="0239.html">Douglas Gilbert: "Re: scsi command queuing"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0225.html">abel deuring: "Re: scsi command queuing"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0233.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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abel deuring wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Oliver Rauch wrote:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> > > Well, I think that the sanei_scsi_req_enter / sanei_scsi_req_wait
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</EM><BR>
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<EM>> > > mechanism should give similar results as command repeating, but the
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</EM><BR>
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<EM>> > > former is more flexible, because you can also sent some status inquiries
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</EM><BR>
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<EM>> > > or whatever between to "read data" commands.
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</EM><BR>
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<EM>> > >
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Any ideas how we can test if sanei_scsI-req_enter is as fast as multiple reads in
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</EM><BR>
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<EM>> > the kernel?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Difficult question; I don't know, if or how it is possible to issue
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</EM><BR>
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<EM>> multiple reads for the Linux kernel. But my guess is, that those
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</EM><BR>
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<EM>> multiple reads would have to be queued just like several SCSI commands
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</EM><BR>
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<EM>> being sent via sanei_scsi_req_enter and a write to the SG device file.
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</EM><BR>
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<EM>> (Douglas, any comments?)
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</EM><BR>
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<P>Queuing up commands to a scanner that doesn't support tagged queuing
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<BR>
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will cause those commands to be queued in the SCSI adapter driver
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<BR>
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(or its silicon). In this case the only benefit to doing this is
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<BR>
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lower latency for sending out the following command. Testing which
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<BR>
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technique is better (other than the gross metric of scan time)
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<BR>
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is a bit difficult.
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<BR>
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<P>Doug Gilbert
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<BR>
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<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:%20scsi%20command%20queuing&In-Reply-To=<395D3ABC.E907A0CB@interlog.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0239.html">Douglas Gilbert: "Re: scsi command queuing"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0225.html">abel deuring: "Re: scsi command queuing"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0233.html">Henning Meier-Geinitz: "Re: scsi command queuing"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Fri Jun 30 2000 - 17:12:06 PDT</EM>
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