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<TITLE>sane-devel: Re: reaction to a smaller buffer size</TITLE>
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<META NAME="Author" CONTENT="abel deuring (a.deuring@satzbau-gmbh.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="Sun Nov 19 13:32:25 2000" -->
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<STRONG>From:</STRONG> abel deuring (<A HREF="mailto:a.deuring@satzbau-gmbh.de?Subject=Re:%20reaction%20to%20a%20smaller%20buffer%20size&In-Reply-To=<3A185A7A.58703CC2@satzbau-gmbh.de>"><EM>a.deuring@satzbau-gmbh.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Nov 19 2000 - 14:55:54 PST
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Oliver Neukum wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> > Oliver,
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > agreed, it is really not likely that we get different amount of memory
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</EM><BR>
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<EM>> > after different open calls. But exactly this can be a problem: Imagine a
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</EM><BR>
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<EM>> > Sane user working on an ooverloaded Linux box, who gets from time to
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</EM><BR>
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<EM>> > time segfaults, and that [s]he can't reproduce this behaviuor reliably.
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</EM><BR>
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<EM>> > How someone get the idea that this behaviour might be caused by a
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</EM><BR>
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<EM>> > changing sanei_scsi_max_request_size?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> There must be a misunderstanding.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> There are situations where it's almost _certain_ that the
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</EM><BR>
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<EM>> kernel _will_ give out buffers of _different_ sizes.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> If you have one host adaptor which does scatter/gather and
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</EM><BR>
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<EM>> a second host adaptor which does no scatter/gather,
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</EM><BR>
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<EM>> the first will result in a buffer of 128K and the second a
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</EM><BR>
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<EM>> buffer of 32K.
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</EM><BR>
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<P>I didn't see this point. But then again: If sanei_scsi_max_request_size
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<BR>
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is not constant, things might be messed up -- not necessarily for the
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<BR>
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Microtek2 backend, but perhaps for the backend of a second scanner
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<BR>
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conncted to the same machine.
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<BR>
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<P>Abel
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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=<3A185A7A.58703CC2@satzbau-gmbh.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0264.html">Michael Vanecek: "sane and gcc 2.96"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Nov 19 2000 - 13:33:36 PST</EM>
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