From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evgeniy Polyakov Subject: Re: Fwd: Packet mmap: TX RING and zero copy Date: Wed, 10 Sep 2008 10:09:01 +0400 Message-ID: <20080910060900.GA12158@2ka.mipt.ru> References: <7e0dd21a0809050830o7c1dcc2do68da5df9900fcfe8@mail.gmail.com> <20080905153811.GA3596@2ka.mipt.ru> <7e0dd21a0809050901q23d0b16xa1a9d0df2f36f6d8@mail.gmail.com> <20080905163446.GB10078@2ka.mipt.ru> <7e0dd21a0809080321p6b9e2bc7m73e2cdd57a8d58b8@mail.gmail.com> <20080908112629.GA26488@2ka.mipt.ru> <7e0dd21a0809080601lc250197wde17733522d03125@mail.gmail.com> <20080908152835.GA16834@2ka.mipt.ru> <20080908153841.GA24683@2ka.mipt.ru> <7e0dd21a0809091611q74b032ffw734d031a4def894b@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: Johann Baudy Return-path: Received: from relay.2ka.mipt.ru ([194.85.80.65]:39584 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751145AbYIJGJf (ORCPT ); Wed, 10 Sep 2008 02:09:35 -0400 Content-Disposition: inline In-Reply-To: <7e0dd21a0809091611q74b032ffw734d031a4def894b@mail.gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: Hi Johann. On Wed, Sep 10, 2008 at 01:11:31AM +0200, Johann Baudy (johaahn@gmail.com) wrote: > We've performed more tests with additional and mandatory processes of > our system. Bitrate and CPU performance were very very low. This > result leads us to brainstorm on a new system design that meets > specifications target. I'll continue these tests once new design > ready. If CPU usage was small, something slept somewhere, but so far we do not know what and where. It would be great to understand, why sendfile() is so slow with UDP especially when mempry bandwidth is very small, and particulary understand if it is udp sending path itself or splice code. > Concerning udp_sendpage() patch, if you agree, I will suggest this > patch to the community in a new thread. Sure, but please remove commented code lines instead of commenting them. -- Evgeniy Polyakov