Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030334AbXBTRS0 (ORCPT ); Tue, 20 Feb 2007 12:18:26 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030313AbXBTRS0 (ORCPT ); Tue, 20 Feb 2007 12:18:26 -0500 Received: from relay.2ka.mipt.ru ([194.85.82.65]:60228 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030321AbXBTRSS (ORCPT ); Tue, 20 Feb 2007 12:18:18 -0500 Date: Tue, 20 Feb 2007 20:18:10 +0300 From: Evgeniy Polyakov To: bert hubert Cc: Andi Kleen , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: all syscalls initially taking 4usec on a P4? Re: nonblocking UDPv4 recvfrom() taking 4usec @ 3GHz? Message-ID: <20070220171809.GA26961@2ka.mipt.ru> References: <20070219231447.GA4400@outpost.ds9a.nl> <20070220162714.GA3245@outpost.ds9a.nl> <20070220164124.GA24930@2ka.mipt.ru> <20070220170232.GA4730@outpost.ds9a.nl> <20070220171120.GD24930@2ka.mipt.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=koi8-r Content-Disposition: inline In-Reply-To: <20070220171120.GD24930@2ka.mipt.ru> User-Agent: Mutt/1.5.9i X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (2ka.mipt.ru [0.0.0.0]); Tue, 20 Feb 2007 20:18:16 +0300 (MSK) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 709 Lines: 16 On Tue, Feb 20, 2007 at 08:11:20PM +0300, Evgeniy Polyakov (johnpol@2ka.mipt.ru) wrote: > I would try it today - but it is a bit late in Moscow already - and > there are some things to complete yet. So, tomorrow I will create a patch > and run it, but I seriously doubt that there is _that_ high per-recvfrom > latency. As of now - syscall which just copies 50 bytes from /dev/zero eats about 400-450 nanosecods per run (core duo 3.7 ghz). -- Evgeniy Polyakov - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/