From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: [PATCH 0/2] netem: trace enhancement Date: Tue, 04 Dec 2007 10:07:31 -0800 Message-ID: <47559763.9050408@candelatech.com> References: <20071120231131.oqn4s5eda84k4csw@email.ee.ethz.ch> <474C2246.50205@ee.ethz.ch> <20071129134554.5c25a891@freepuppy.rosehill> <474F3719.30101@trash.net> <47503971.9080509@ee.ethz.ch> <4753B423.7030000@trash.net> <4753C874.80703@ee.ethz.ch> <47543E65.4060303@trash.net> <47544B1F.1010902@candelatech.com> <20071204154535.4eu35nfe9wks8kgg@email.ee.ethz.ch> <47559119.6070803@candelatech.com> <47559455.1080009@ee.ethz.ch> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: Patrick McHardy , Stephen Hemminger , netdev@vger.kernel.org, herbert@gondor.apana.org.au, Rainer Baumann To: Ariane Keller Return-path: Received: from ns2.lanforge.com ([66.165.47.211]:36723 "EHLO ns2.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752264AbXLDSHl (ORCPT ); Tue, 4 Dec 2007 13:07:41 -0500 In-Reply-To: <47559455.1080009@ee.ethz.ch> Sender: netdev-owner@vger.kernel.org List-ID: Ariane Keller wrote: > I thought about that as well, but in my opinion this does not help much. > It's the same as before: in average every 10ms a new buffer needs to > be filled. But, you can fill 50 or 100 at a time, so if user-space is delayed for a few ms, the kernel still has plenty of buffers to work with until user-space gets another chance. I'm not worried about average thoughput of user-space to kernel, just random short-term starvation. Thanks, Ben -- Ben Greear Candela Technologies Inc http://www.candelatech.com