Date: Mon, 19 Nov 2007 19:46:45 +0100 From: Kris Kennaway <kris@FreeBSD.org> To: Alexey Popov <lol@chistydom.ru> Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@freebsd.org> Subject: Re: 2 x quad-core system is slower that 2 x dual core on FreeBSD Message-ID: <4741DA15.9000308@FreeBSD.org> In-Reply-To: <4741A7DA.2050706@chistydom.ru> References: <4741905E.8050300@chistydom.ru> <fhs3s5$knj$1@ger.gmane.org> <47419AB3.5030008@chistydom.ru> <fhs7hp$2es$2@ger.gmane.org> <4741A7DA.2050706@chistydom.ru>
next in thread | previous in thread | raw e-mail | index | archive | help
Alexey Popov wrote: > Hi. > > Ivan Voras wrote: >>> CPU states: 9.5% user, 0.0% nice, 82.0% system, 0.5% interrupt, 8.0% >>> idle >> A wild idea that might not help: try reducing kern.hz in loader.conf to >> something like 100 and see if something significant changes. > Now it runs with hz=100, number of context switches became ~ 2 times > less, but still there's 90% system CPU load (see attach). System CPU usage doesn't tell you anything by itself, you need to look at how much work the system is actually doing (pages served/second, or whatever). For example, when your kernel is getting more work done, system CPU usage will also be higher. Kris
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4741DA15.9000308>