Date: Sun, 06 Nov 2005 11:20:55 -0800 From: Nate Lawson <nate@root.org> To: =?ISO-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no> Cc: cvs-src@FreeBSD.org, Mike Silbersack <silby@silby.com>, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/conf files src/sys/modules/acpi/acpi Makefile src/sys/dev/acpica acpi_battery.c acpi_smbat.c acpi_smbus.h acpiio.h Message-ID: <436E5797.7090605@root.org> In-Reply-To: <861x1u55qg.fsf@xps.des.no> References: <200511052355.jA5NtuPg026403@repoman.freebsd.org> <20051105191616.M870@odysseus.silby.com> <861x1u55qg.fsf@xps.des.no>
next in thread | previous in thread | raw e-mail | index | archive | help
Dag-Erling Smørgrav wrote: > Mike Silbersack <silby@silby.com> writes: > >>2. Now, powerd seems to be causing ~30% system cpu load - top shows >>it switching between the "nanslp" and "ecpoll" wait states. This may >>be due to some other recent change to acpi, I'm not sure how to best >>test. > > > Try running powerd with a 5000 ms polling interval. With the default > of 500 ms, it never seems to stabilize, but keeps oscillating wildly > in the 75-300 MHz range on my Dell Latitude D600. That is bad for performance. It can then take up to 10-15 seconds to promote back to 100% CPU when your system becomes busy. I've said it many times: we need a real predictive algorithm. Taking a single sample will always have hysteresis problems. See the acpi@ list archives for much more detail and a good summary, including linked papers, here. http://wikitest.freebsd.org/moin.cgi/powerd -- Nate
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?436E5797.7090605>