46 lines
1.7 KiB
HTML
46 lines
1.7 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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<HTML>
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<HEAD>
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<META NAME="GENERATOR" CONTENT="SGML-Tools 1.0.9">
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<TITLE>The Linux SCSI programming HOWTO: Driver Defaults</TITLE>
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<LINK HREF="SCSI-Programming-HOWTO-14.html" REL=next>
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<LINK HREF="SCSI-Programming-HOWTO-12.html" REL=previous>
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<LINK HREF="SCSI-Programming-HOWTO.html#toc13" REL=contents>
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</HEAD>
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<A HREF="SCSI-Programming-HOWTO-14.html">Next</A>
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<A HREF="SCSI-Programming-HOWTO.html#toc13">Contents</A>
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<HR>
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<H2><A NAME="s13">13. Driver Defaults</A></H2>
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<P>
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<A NAME="sec-Defaults"></A> <H2><A NAME="ss13.1">13.1 Transfer Lengths</A>
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</H2>
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<P>
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<A NAME="sec-length"></A>
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Currently (at least up to kernel version 1.1.68) input and output
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sizes have to be less than or equal than 4096 bytes unless the kernel
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has been compiled with <CODE>SG_BIG_BUFF</CODE> defined, if which case it is
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limited to <CODE>SG_BIG_BUFF</CODE> (e.g. 32768) bytes. These sizes include
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the generic header as well as the command block on input.
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<CODE>SG_BIG_BUFF</CODE> can be safely increased upto (131072 - 512). To take
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advantage of this, a new kernel has to be compiled and booted, of course.
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<P>
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<H2><A NAME="ss13.2">13.2 Timeout And Retry Values</A>
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</H2>
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<P>The default timeout value is set to one minute (<CODE>Timeout</CODE> = 6000).
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It can be changed through an ioctl call (see section
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<A HREF="SCSI-Programming-HOWTO-12.html#sec-ioctl">sec-ioctl</A>
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).
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The default number of retries is one.
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<P>
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<A HREF="SCSI-Programming-HOWTO-14.html">Next</A>
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<A HREF="SCSI-Programming-HOWTO.html#toc13">Contents</A>
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