Messages in this thread | | | Date | Tue, 23 Sep 2008 16:03:52 -0400 | From | Masami Hiramatsu <> | Subject | Re: Unified tracing buffer |
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Thomas Gleixner wrote: > On Tue, 23 Sep 2008, Masami Hiramatsu wrote: >> # cat /sys/devices/system/cpu/cpu0/cpuidle/state3/usage >> 171210 > > C3 stops the TSC. So depending on how many C3 entries you have on the > different cores, your TSCs will drift apart. Some BIOSes do even a > lousy job trying to fixup the TSCs on exit from C3, which makes things > even worse. > >> C1: type[C1] promotion[--] demotion[--] latency[001] usage[00000016] duration[00000000000000000000] >> C2: type[C2] promotion[--] demotion[--] latency[001] usage[00037969] duration[00000000000024288003] >> C3: type[C3] promotion[--] demotion[--] latency[057] usage[00171818] duration[00000000001881257636] >> >> Could these help you? > > Yup, explains your TSC observation. Nothing we can do about. Broken by > system design :( Welcome in the wonderful world of Inhell/BIOS/ACPI !
Thank you for analyzing! :-) Hmm, then could I fix that by fixing my dsdt...?
Thanks again,
> > Thanks, > > tglx
-- Masami Hiramatsu
Software Engineer Hitachi Computer Products (America) Inc. Software Solutions Division
e-mail: mhiramat@redhat.com
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