linux-kernel - Re: bizarre network timing problem

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Message-ID: <20071102223856.GA5121@codeblau.de>
Date:	Fri, 2 Nov 2007 23:38:56 +0100
From:	Felix von Leitner <felix-linuxkernel@...e.de>
To:	Rick Jones <rick.jones2@...com>
Cc:	Chuck Ebbert <cebbert@...hat.com>, linux-kernel@...r.kernel.org,
	Netdev <netdev@...r.kernel.org>
Subject: Re: bizarre network timing problem

Thus spake Rick Jones (rick.jones2@...com):
> >Oh I'm pretty sure it's not my application, because my application performs
> >well over ethernet, which is after all its purpose.  Also I see the
> >write, the TCP uncork, then a pause, and then the packet leaving.
> Well, a wise old engineer tried to teach me that the proper spelling is 
> ass-u-me :) so just for grins, you might try the TCP_RR test anyway :)  And 
> even if your application is correct (although I wonder why the receiver 
> isn't sucking data-out very quickly...) if you can reproduce the problem 
> with netperf it will be easier for others to do so.

My application is only the server, the receiver is smbget from Samba, so
I don't feel responsible for it :-)

Still, when run over Ethernet, it works fine without waiting for
timeouts to expire.

To reproduce this:

  - smbget is from samba, you probably already have this
  - gatling (my server) can be gotten from
    cvs -d :pserver:cvs@....fefe.de:/cvs -z9 co dietlibc libowfat gatling

dietlibc is not strictly needed, but it's my environment.
First built dietlibc, then libowfat, then gatling.

Felix
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