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<TITLE>The Answer Guy 37: TCP/IP SACK Support: When? Now!</TITLE>
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
<img src="../../gx/dennis/qbubble.gif" alt="(?)"
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<font color="#B03060">The Answer Guy</font>
<img src="../../gx/dennis/bbubble.gif" alt="(!)"
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<BR>
<H4>By James T. Dennis,
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
</H4>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
height="50" width="60" alt="(?) " border="0"
>TCP/IP SACK Support: When? Now!</H3>
<p><strong>From Alan Richard on Fri, 22 Jan 1999
</strong></p>
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TCP/IP SACK Support: When? Now!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Upon further investigation, I see that the 2.1.90 and later kernels have
implemented RFCs 2018 and 1323. I found this on the
<a href="http://www.psc.edu/networking/perf_tune.html"
>http://www.psc.edu/networking/perf_tune.html</a>
page.
</STRONG></P>
<P><STRONG>
Thanks anyway,
Alan
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Thanks for following up some quickly with the
answer to your own question. I was going to have
to hunt through kernel sources and the kernel
mailing list if I was going to answer this one.
</BLOCKQUOTE>
<BLOCKQUOTE>
To give you and idea of just how ugly that would be
let me ask:
</BLOCKQUOTE>
<BLOCKQUOTE><BlockQuote>
What is the TCP/IP SACK feature?
What does it do?
</BlockQuote></BLOCKQUOTE>
<BLOCKQUOTE>
Why do we need/want it?
</BLOCKQUOTE>
<BLOCKQUOTE>
It the Linux implementation any better or
worse than others? (Or is it some feature
where you pretty much either have it or
you don't and there is no "better" or "worse")?
</BLOCKQUOTE>
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Alan Richard wrote:
</STRONG></P>
<P><STRONG><FONT COLOR="#000066"><EM><BlockQuote>
Hey AnswerGuy,
</BlockQuote></EM></FONT></STRONG></P>
<P><STRONG><FONT COLOR="#000066"><EM>
Do you know anyone with a good implementation of SACK for Linux? I'm
running RedHat Linux 2.0.36. I've searched the web a bit under TCP,
SACK, and RFC 2018, and have yet to find any patch available for
download.
</EM></FONT></STRONG></P>
<P><STRONG><FONT COLOR="#000066"><EM>
My officemate, Mark Allman, is the co-chair of the IETF TCP
Implementation Working Group. He says that SACK and Large Windows (RFC
1323) are now the standard for TCP, with Windows98 and Sun 2.6 having
them already implemented. Where is the Linux community with respect to
implementing these? (Mark would like to know, too.)
</EM></FONT></STRONG></P>
<P><STRONG><FONT COLOR="#000066"><EM>
Thanks
</EM></FONT></STRONG></P>
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<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
>Copyright &copy;</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 37 February 1999</H5>
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