Re: [BUG] jiffies counter leaps in 2.6.24-rc3

Stefano Brivio
2007-11-29T08:53:19Z

Ok, I found out how to reliably reproduce this bug. The root session issue
was a bit weird, but I noticed I usually switch to root only when I need to
change the CPU frequency. And here's what happens:

# cpuspeedy min
[after some time...]
Nov 29 09:42:31 morte [ 4408.722597] b43-phy0 ERROR: PHY transmission error

# cpuspeedy max
Nov 29 09:42:41 morte [ 1177.238599] wmaster0: STA 00:14:c1:35:8d:eb Average rate: 540 (2160/4)

It looks like jiffies get scaled exactly by a 3.75 factor, which is
<max_frequency>/<min_frequency> here. I use acpi-cpufreq and this is my
(only) CPU:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.50GHz
stepping : 6
cpu MHz : 1500.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe bts est tm2
bogomips : 2993.49
clflush size : 64

Any hint?

--
Ciao
Stefano