From owner-freebsd-current@FreeBSD.ORG Wed Dec 10 20:03:26 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id BCCB316A4CE for ; Wed, 10 Dec 2003 20:03:26 -0800 (PST) Received: from mail.chesapeake.net (chesapeake.net [208.142.252.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id 4792343D2C for ; Wed, 10 Dec 2003 20:03:23 -0800 (PST) (envelope-from jroberson@chesapeake.net) Received: from localhost (jroberson@localhost) by mail.chesapeake.net (8.11.6/8.11.6) with ESMTP id hBB43Hg58767; Wed, 10 Dec 2003 23:03:18 -0500 (EST) (envelope-from jroberson@chesapeake.net) Date: Wed, 10 Dec 2003 23:03:17 -0500 (EST) From: Jeff Roberson To: Andy Farkas In-Reply-To: <20031211085336.O13173@hewey.af.speednet.com.au> Message-ID: <20031210230206.R4201-100000@mail.chesapeake.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: current@freebsd.org Subject: Re: ULE and current. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Dec 2003 04:03:26 -0000 On Thu, 11 Dec 2003, Andy Farkas wrote: > > The scheduling of nice processes seems to be broken: This is actually a problem in the load balancer. It's not taking nice into consideration when attempting to balance the load. > > team2# nice -7 sh -c "while :; do echo -n;done" & > team2# nice -7 sh -c "while :; do echo -n;done" & > team2# sleep 120; top -S > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND > 675 root 133 -7 1576K 952K CPU1 1 1:52 75.78% 75.78% sh > 676 root 133 -7 1576K 952K RUN 1 1:39 73.44% 73.44% sh > 12 root -16 0 0K 12K RUN 0 18:46 55.47% 55.47% idle: cpu0 > 11 root -16 0 0K 12K RUN 1 7:00 0.00% 0.00% idle: cpu1 > > > Adding a third nice process eliminates the idle time, but cpu% is still bad: > > team2# nice -7 sh -c "while :; do echo -n;done" & > team2# sleep 120; top -S > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND > 705 root 133 -7 1576K 952K CPU0 0 1:53 100.78% 100.78% sh > 675 root 133 -7 1576K 952K RUN 1 12:12 51.56% 51.56% sh > 676 root 133 -7 1576K 952K RUN 1 11:30 49.22% 49.22% sh > 729 root 76 0 2148K 1184K CPU1 1 0:00 0.78% 0.78% top > 12 root -16 0 0K 12K RUN 0 24:00 0.00% 0.00% idle: cpu0 > 11 root -16 0 0K 12K RUN 1 7:00 0.00% 0.00% idle: cpu1 I agree that 100.78% is wrong. Also, the long term balancer should be kicking one sh process off of the doubly loaded cpu every so often. I'll look into this, thanks. Cheers, Jeff > > > The box is a dual P133 running -current from 8th Dec. > > -- > > :{ andyf@speednet.com.au > > Andy Farkas > System Administrator > Speednet Communications > http://www.speednet.com.au/ > >