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<TITLE>sane-devel: Re: reaction to a smaller buffer size</TITLE>
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<META NAME="Author" CONTENT="Henning Meier-Geinitz (hmg-ml@gmx.de)">
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<META NAME="Subject" CONTENT="Re: reaction to a smaller buffer size">
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<H1>Re: reaction to a smaller buffer size</H1>
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<!-- received="Sat Nov 18 15:03:50 2000" -->
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<!-- sent="Sat, 18 Nov 2000 22:46:53 +0100" -->
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<!-- isosent="20001118214653" -->
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<!-- name="Henning Meier-Geinitz" -->
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<!-- subject="Re: reaction to a smaller buffer size" -->
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<STRONG>From:</STRONG> Henning Meier-Geinitz (<A HREF="mailto:hmg-ml@gmx.de?Subject=Re:%20reaction%20to%20a%20smaller%20buffer%20size&In-Reply-To=<20001118224652.A4375@vortex.swb.de>"><EM>hmg-ml@gmx.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sat Nov 18 2000 - 13:46:53 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0242.html">Henning Meier-Geinitz: "Re: Patches for saned/net/scanimage/user-authorization...."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0240.html">Jochen Eisinger: "Re: Patches for saned/net/scanimage/user-authorization...."</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0239.html">Oliver Neukum: "reaction to a smaller buffer size"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0254.html">abel deuring: "Re: reaction to a smaller buffer size"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0254.html">abel deuring: "Re: reaction to a smaller buffer size"</A>
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<HR NOSHADE><P>
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<P>
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Hi,
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<BR>
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<P>On Sat, Nov 18, 2000 at 10:11:21PM +0100, Oliver Neukum wrote:
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<BR>
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<EM>> Hi,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I'd like to ask whether that check
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> if (real_buffersize != wanted_buffersize)
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</EM><BR>
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<EM>> {
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</EM><BR>
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<EM>> DBG(1, "sanei_scsi_open: could not allocate SG buffer memory "
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</EM><BR>
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<EM>> "wanted: %i got: %i\n", wanted_buffersize, real_buffersize);
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</EM><BR>
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<EM>> sanei_scsi_close(*fdp);
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</EM><BR>
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<EM>> return SANE_STATUS_NO_MEM;
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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>> in sanei_scsi.c might be removed. It makes using SANE with scsi drivers
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</EM><BR>
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<EM>> which don't do scatter/gather very hard.
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</EM><BR>
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<P>I don't understand this fully. With sanei_scsi_open there is no way to
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<BR>
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tell the backend that the buffersize is smaller than expected. What
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<BR>
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happens if the backend sends a bigger buffer than allowed? Is it just
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<BR>
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slowed down or does the SCSI call return with an error?
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<BR>
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sanei_scsi_open already reduces the buffer size if
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<BR>
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proc/sys/kernel/sg-big-buff has a lower value but the backend can't
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<BR>
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find out about it if I understood correctly.
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<BR>
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<P>Why don't you use sanei_scsi_open_extended if it is available for your
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<BR>
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paltform? In this case the backend can try to get a big buffer and
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<BR>
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knows the actual size it is allowed to use.
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<BR>
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<P><P>Bye,
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<BR>
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Henning
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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:%20reaction%20to%20a%20smaller%20buffer%20size&In-Reply-To=<20001118224652.A4375@vortex.swb.de>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0242.html">Henning Meier-Geinitz: "Re: Patches for saned/net/scanimage/user-authorization...."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0240.html">Jochen Eisinger: "Re: Patches for saned/net/scanimage/user-authorization...."</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0239.html">Oliver Neukum: "reaction to a smaller buffer size"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0254.html">abel deuring: "Re: reaction to a smaller buffer size"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0254.html">abel deuring: "Re: reaction to a smaller buffer size"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sat Nov 18 2000 - 15:06:48 PST</EM>
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