From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263479AbTJOQOp (ORCPT ); Wed, 15 Oct 2003 12:14:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263480AbTJOQOp (ORCPT ); Wed, 15 Oct 2003 12:14:45 -0400 Received: from azgamers.com ([68.98.208.145]:31628 "HELO azgamers.com") by vger.kernel.org with SMTP id S263479AbTJOQOo (ORCPT ); Wed, 15 Oct 2003 12:14:44 -0400 From: "Matt H." To: Linux Kernel Subject: Re: incoming packet latency in 2.4.[18-20] Date: Wed, 15 Oct 2003 09:15:56 -0700 User-Agent: KMail/1.5.9 References: <3F8D6BB0.7060809@nortelnetworks.com> In-Reply-To: <3F8D6BB0.7060809@nortelnetworks.com> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200310150915.56857.lkml@lpbproductions.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Have you tried a more recent kernel? Matt H. On Wednesday 15 October 2003 08:45 am, Chris Friesen wrote: > There is an issue with incoming packet latency in the kernels mentioned. > > It seems that if you send in a burst of messages, the amount of time it > takes to wake the listening process is dependent on the size of the > message burst. 2.4.18-2.4.20 all show this behaviour, 2.6 doesn't. > > Some numbers for a udp message size of 2 bytes: > > 1 packet, average latency 12 usecs > 10 packets, average latency 66 usecs > 100 packets, average latency 477 usecs > > Is this a known issue? Is there an easy way to fix this, or is it > something inherent in the 2.4 architecture? > > Thanks, > > Chris