Unfortunately, my BIOS doesn't give such an option. Was told that 2.6.33.5-26.1-ivi successfully enabled HPET, has there been an issue with the older kernel not exposing it correctly?
Unfortunately (again), this platform's IOH drivers aren't ready for the newer kernel, so I can't verify this. Thanks, -Bryan -----Original Message----- From: Arjan van de Ven [mailto:[email protected]] Sent: Thursday, January 20, 2011 1:22 PM To: Bernhart, Bryan Cc: [email protected] Subject: Re: [Meego-kernel] TunnelCreek clocksource limited to ACPI_PM - poor performance On 1/21/2011 2:55 AM, Bernhart, Bryan wrote: > > I've been noticing an excess amount of kernel (2.6.33.5-23-1006-ivi) > overhead contributed from volatile reads of the ACPI interface. Upon > investigation, the primary clocksource was using the rather less > efficient ACPI_PM after TSC fails the idle test, and switches over. > > Interesting enough, a closer (on chip solution I believe) clocksource > called "tsc_constant" shows up when I run the query cpuinfo. But this > isn't an available clocksource. The kernel was compiled with TSC & > HPET support, but I would like to know if anyone could shed some light > about enabling a faster clocksource or diagnosing the existing clock > overhead. This is a Tunnelcreek 1.5Ghz sku. > tsc will stop in idle (constant just means "fixed frequency", eg does not change if the frequency of the cpu changes) you should have HPET enabled in the bios to use it.... _______________________________________________ MeeGo-kernel mailing list [email protected] http://lists.meego.com/listinfo/meego-kernel
