From mboxrd@z Thu Jan 1 00:00:00 1970 From: bert hubert Subject: Re: [RESEND] tuning linux for high network performance? Date: Wed, 23 Oct 2002 15:01:01 +0200 Sender: linux-kernel-owner@vger.kernel.org Message-ID: <20021023130101.GA646@outpost.ds9a.nl> References: <200210231218.18733.roy@karlsbakk.net> <200210231306.18422.roy@karlsbakk.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@oss.sgi.com, Kernel mailing list Return-path: To: Roy Sigurd Karlsbakk Content-Disposition: inline In-Reply-To: <200210231306.18422.roy@karlsbakk.net> List-Id: netdev.vger.kernel.org On Wed, Oct 23, 2002 at 01:06:18PM +0200, Roy Sigurd Karlsbakk wrote: > > I've got this video server serving video for VoD. problem is the P4 1.8 > > seems to be maxed out by a few system calls. The below output is for ~50 > > clients streaming at ~4.5Mbps. if trying to increase this to ~70, the CPU > > maxes out. '50 clients *each* streaming at ~4.4MBps', better make that clear, otherwise something is *very* broken. Also mention that you have an e1000 card which does not do outgoing checksumming. You'd think that a kernel would be able to do 250megabits of TCP checksums though. > ...adding the whole profile output - sorted by the first column this time... > > 905182 total 0.4741 > 121426 csum_partial_copy_generic 474.3203 > 93633 default_idle 1800.6346 > 74665 do_wp_page 111.1086 Perhaps the 'copy' also entails grabbing the page from disk, leading to inflated csum_partial_copy_generic stats? Where are you serving from? Regards, bert -- http://www.PowerDNS.com Versatile DNS Software & Services http://lartc.org Linux Advanced Routing & Traffic Control HOWTO