From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: Congestion Avoidance Monitoring Tools Date: Fri, 21 Apr 2006 08:19:17 -0700 Message-ID: <20060421081917.34ea952b@localhost.localdomain> References: <1145597174.12413.17.camel@piet2.bluelane.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, linux-net@vger.kernel.org Return-path: Received: from smtp.osdl.org ([65.172.181.4]:60346 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S932354AbWDUPT3 (ORCPT ); Fri, 21 Apr 2006 11:19:29 -0400 To: piet@bluelane.com In-Reply-To: <1145597174.12413.17.camel@piet2.bluelane.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, 20 Apr 2006 22:26:14 -0700 Piet Delaney wrote: > I'm upgrading our 2.6.12 kernel to 2.6.13, which includes significant > congestion avoidance code additions and changes. I was wondering if > there are any tools folks can recommend for testing the kernel to make > sure the congestion avoidance code is operating correctly. For > example the displaying of the congestion window as a function of time > while undergoing convergence. For causing congestion I could modify > a kernel to discard packets once in a while on a lab gateway and hit > it with iperf. HP's netperf looks interesting. > > Any suggestions? > > > -piet > 2.6.13 still had lots of problems, things didn't really get working right till 2.6.15 or later. Especially with TSO. I have a tool using kprobe's see http://developer.osdl.org/shemminger/prototypes/tcpprobe.tar.gz I try to keep it up to date with current kernel and build process, last used it on 2.6.16.