Date: Wed, 01 Sep 2010 16:18:34 +0200 From: Alexander Leidinger <Alexander@Leidinger.net> To: Alexander Motin <mav@FreeBSD.org> Cc: freebsd-hackers@FreeBSD.org, FreeBSD-Current <freebsd-current@FreeBSD.org> Subject: Re: One-shot-oriented event timers management Message-ID: <20100901161834.198574t14uxayygw@webmail.leidinger.net> In-Reply-To: <4C7A5C28.1090904@FreeBSD.org> References: <4C7A5C28.1090904@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Quoting Alexander Motin <mav@FreeBSD.org> (from Sun, 29 Aug 2010 16:10:00 +0300): > I have actively tested this code for a few days on my amd64 Core2Duo > laptop and i386 Core-i5 desktop system. With C2/C3 states enabled > systems experience only about 100-150 interrupts per second, having HZ > set to 1000. These events mostly caused by several event-greedy > processes in our tree. I have traced and hacked several most aggressive > ones in this patch: http://people.freebsd.org/~mav/tm6292_idle.patch . > It allowed me to reduce down to as low as 50 interrupts per system, > including IPIs! It looks like you are comming to a point where Powertop would be helpful. There's a dtracified version of it available at the opensolaris site (it would at least need some additional dtrace probes in our kernel). http://hub.opensolaris.org/bin/view/Project+tesla/Powertop Bye, Alexander. -- Our customers' paperwork is profit. Our own paperwork is loss. http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100901161834.198574t14uxayygw>