From mboxrd@z Thu Jan 1 00:00:00 1970 From: Evgeniy Polyakov Subject: Re: Fwd: Packet mmap: TX RING and zero copy Date: Mon, 8 Sep 2008 19:38:42 +0400 Message-ID: <20080908153841.GA24683@2ka.mipt.ru> References: <7e0dd21a0809050745w692328b7v6dd4e0adf59e9535@mail.gmail.com> <20080905145902.GA12762@2ka.mipt.ru> <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> 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]:57324 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752172AbYIHPjM (ORCPT ); Mon, 8 Sep 2008 11:39:12 -0400 Content-Disposition: inline In-Reply-To: <20080908152835.GA16834@2ka.mipt.ru> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, Sep 08, 2008 at 07:28:35PM +0400, Evgeniy Polyakov (johnpol@2ka.mipt.ru) wrote: > What is CPU usage on sender when it sends data via UDP sendfile()? Actually we can determine the culprit via putting a loop into udp_sendpage(), which will send the same data. if receiver will see the same delayes, problem in the udp sending path, otherwise in splice code. -- Evgeniy Polyakov