Messages in this thread | | | Subject | Re: [patch 00/21] high resolution timers / dynamic ticks - V2 | From | Valdis.Kletnieks@vt ... | Date | Mon, 02 Oct 2006 09:02:03 -0400 |
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On Sun, 01 Oct 2006 22:59:01 -0000, Thomas Gleixner said: > the following patch series is an update in response to your review.
First runtime results - no lockups or other severe badness in a half-hour or so of running.
-mm2-hrt-dynticks5 shows severe clock drift issues if you run 'cpuspeed'.
Using speedstep-ich as a kernel built-in, and cpuspeed is invoked as:
cpuspeed -d -n -i 10 -p 10 50 -a /proc/acpi/ac_adapter/*/state
If cpuspeed drops the CPU speed from the default 1.6Ghz down to 1.2Ghz (the only 2 speeds available on this core), the system clock proceeds to lose about 15 seconds a minute. I haven't dug further into why yet. (If the system is busy so cpuspeed keeps the processor at 1.6Ghz, the clock doesn't drift as much - so it looks like a "when speed is 1.2Ghz" issue...)
I'm also seeing gkrellm reporting about 25% CPU use when "near-idle" (X is up but not much is going on) when that's usually down around 5-6%. I need to collect some oprofile numbers and investigate that as well. [unhandled content-type:application/pgp-signature] | |