Date: Sat, 19 Aug 2000 00:57:52 +0200 From: "H. Eckert" <ripley@nostromo.in-berlin.de> To: freebsd-security@FreeBSD.ORG Subject: Re: [Q] why does my firewall degrade Web performance? Message-ID: <20000819005752.A42236@server.nostromo.in-berlin.de> In-Reply-To: <Pine.BSF.4.10.10008180932120.25370-100000@bsdie.rwsystems.net>; from jwyatt@rwsystems.net on Fri, Aug 18, 2000 at 09:36:43AM -0500 References: <200008171558.JAA23163@nomad.yogotech.com> <Pine.BSF.4.10.10008180932120.25370-100000@bsdie.rwsystems.net>
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Quoting James Wyatt (jwyatt@rwsystems.net): > Doesn't load average count the average number of processes waiting on > (or in) a 'run' state? Don't the ipfw functions get performed by the > kernel? If so, wouldn't the only rise in load average be from a > secondary effect on 'coalmine canary' like programs? If you aren't > running apache or lotsa sendmail or something would loadave even go up > much under heavy load? Well, yes. But look at "top" which monitors active processes: last pid: 42568; load averages: 0.11, 0.06, 0.01 up 57+22:27:13 00:44:58 48 processes: 1 running, 47 sleeping CPU states: 0.4% user, 0.0% nice, 0.0% system, 0.0% interrupt, 99.6% idle Mem: 10M Active, 5768K Inact, 9596K Wired, 3428K Cache, 3394K Buf, 488K Free Swap: 254M Total, 30M Used, 224M Free, 12% Inuse As you can see in the output, my machine is 99.6% idle. If there's a lot of network activity at the kernel level going on, it is shown as system or interrupt load. So one can easily see how busy the machine is, even if there's no user process actively using up CPU cycles. Greetings, Ripley -- H. Eckert, 10777 Berlin, Germany, http://me.in-berlin.de/~nostromo/ ISO 8859-1: Ä=Ae, Ö=Oe, Ü=Ue, ä=ae, ö=oe, ü=ue, ß=sz. "(Technobabbel)" (Jetrel) - "Müssen wir uns diesen Schwachsinn wirklich anhören?" (Neelix) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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