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howto-html-en-20080722-2mdv2010.1.noarch.rpm

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<H2><A NAME="s13">13. Driver Defaults</A></H2>

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<A NAME="sec-Defaults"></A> <H2><A NAME="ss13.1">13.1 Transfer Lengths</A>
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<A NAME="sec-length"></A> 
Currently (at least up to kernel version 1.1.68) input and output
sizes have to be less than or equal than 4096 bytes unless the kernel
has been compiled with <CODE>SG_BIG_BUFF</CODE> defined, if which case it is
limited to <CODE>SG_BIG_BUFF</CODE> (e.g. 32768) bytes.  These sizes include
the generic header as well as the command block on input.
<CODE>SG_BIG_BUFF</CODE> can be safely increased upto (131072 - 512). To take
advantage of this, a new kernel has to be compiled and booted, of course.
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<H2><A NAME="ss13.2">13.2 Timeout And Retry Values</A>
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<P>The default timeout value is set to one minute (<CODE>Timeout</CODE> = 6000).
It can be changed through an ioctl call (see section 
<A HREF="SCSI-Programming-HOWTO-12.html#sec-ioctl">sec-ioctl</A>
).
The default number of retries is one.
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