Re: [1/3] Bugfix: Don't use the TSC in sched_clock if unstable

[Guillaume Chazarain]

2007/3/4, Andi Kleen <ak@xxxxxxx>:

> On what hardware?

Pentium M 798 MHz -> 2GHz

> And how many frequency transitions do you have per second?

10 in a kernel compile exhibiting audio skips.

Anyway, the "Clocksource tsc unstable (delta = -263211549 ns)" line
in the dmesg I attached to the previous mail confirms IMHO that my
TSC is too unstable for scheduling purpose.

15 minutes after booting, including a kernel compile halted on the
first audio skip, I have this in
/sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table

  From  :    To
        :   1995000   1596000   1330000   1064000    798000
 1995000:         0        67       101       128       367
 1596000:        20         0         3         3        41
 1330000:        21         0         0        10        73
 1064000:        30         0         0         0       111
  798000:       592         0         0         0         0

Nothing alarming I presume.

Thanks.

--
Guillaume

Attachment: cpuinfo
Description: Binary data