Gentoo Logo
Gentoo Spaceship




Note: Due to technical difficulties, the Archives are currently not up to date. GMANE provides an alternative service for most mailing lists.
c.f. bug 424647
List Archive: gentoo-performance
Navigation:
Lists: gentoo-performance: < Prev By Thread Next > < Prev By Date Next >
Headers:
To: gentoo-performance@g.o
From: "Ritesh Kumar" <ritesh@...>
Subject: Re: TCP perfomance
Date: Sat, 7 Jun 2008 12:54:40 -0400
There are quite a few things that make TCP performance degrade. Is there a specific reason why you thought about TCP timestamps?<br>A good way to know is to launch a TCP connection and get it to a stage where you can clearly see its performance suffer. Then first take a look at the CPU usage... if its 100% only then you should conclude that the problem is with the CPU usage aspect of it.<br>
In my experience, there can be many other things that may go wrong. There are quite a few &#39;TCP tuning&#39; faqs around the Internet. You might want to go through a few to see some commonly used solutions.<br><br>OTOH, TCP timestamps are an important part of TCP... may be not for a LAN like system but definitely for a complicated network like the Internet, where timestamps help TCP to easily infer round trip times with much more precision than otherwise.<br>
<br>_r<br><br><div class="gmail_quote">On Fri, Jun 6, 2008 at 1:26 PM, Kevin Faulkner &lt;<a href="mailto:kevlar.kernel@...">kevlar.kernel@...</a>&gt; wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">Miguel Sousa Filipe wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
There is no such thing has a TCP timestamp:<br>
<a href="http://freebie.fatpipe.org/%7Emjb/Drawings/TCP_Header.png" target="_blank">http://freebie.fatpipe.org/~mjb/Drawings/TCP_Header.png</a><br>
<br>
so, that doesn&#39;t make any sense...<br>
</blockquote></div>
Your right and I&#39;m wrong.<br>
Its not in the header, its thrown on at the end....<br>
try doing<br>
cat /proc/sys/net/ipv4/tcp_timestamps<br>
<br>
<a href="http://www.networksorcery.com/enp/protocol/tcp/option008.htm" target="_blank">http://www.networksorcery.com/enp/protocol/tcp/option008.htm</a><br>
<a href="http://www.securiteam.com/securitynews/5NP0C153PI.html" target="_blank">http://www.securiteam.com/securitynews/5NP0C153PI.html</a><br><font color="#888888">
-- <br></font><div><div></div><div class="Wj3C7c">
<a href="mailto:gentoo-performance@g.o" target="_blank">gentoo-performance@g.o</a> mailing list<br>
<br>
</div></div></blockquote></div><br>
References:
TCP perfomance
-- Kevin Faulkner
Re: TCP perfomance
-- Miguel Sousa Filipe
Re: TCP perfomance
-- Kevin Faulkner
Navigation:
Lists: gentoo-performance: < Prev By Thread Next > < Prev By Date Next >
Previous by thread:
Re: TCP perfomance
Next by thread:
Re: TCP perfomance
Previous by date:
RE: unsubscribe
Next by date:
Re: TCP perfomance


Updated Jun 17, 2009

Summary: Archive of the gentoo-performance mailing list.

Donate to support our development efforts.

Copyright 2001-2013 Gentoo Foundation, Inc. Questions, Comments? Contact us.