From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Carlson Date: Mon, 11 Jan 2010 14:38:12 +0000 Subject: Re: slow transfer speed issue between two ppp based servers Message-Id: <4B4B37D4.1050505@workingcode.com> List-Id: References: <4B4AFA68.4020500@powercraft.nl> In-Reply-To: <4B4AFA68.4020500@powercraft.nl> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ppp@vger.kernel.org Jelle de Jong wrote: > Hello everybody, > > I am having a connection speed issue between two ppp based servers, > and I have no idea what is going wrong and how to fix it. > > I would appreciated it if somebody with advanced networking skills can > take a look at my attachments with tcpdumps and my analyse report. > > http://filebin.ca/hgnpt/tcpdumps.tar.gz Is there any chance you could make the raw tcpdump files (rather than the decoded text output) available? It's much harder to debug things when information has been subtracted. Based on what little is available here, I'm seeing what seems to be an RTT that jumps around a lot, from a few milliseconds on up to 150 milliseconds, and causing TCP to misbehave. It's likely that this is a kernel issue that needs to be investigated. -- James Carlson 42.703N 71.076W