Bug#384032: powernowd: Only scales down one core on dual-core opteron 285

[Henrik Lundberg <henrik@chamalulu.com>]

Package: powernowd
Version: 1.00-2
Followup-For: Bug #384032

Dear Maintainer,

My system has an Intel Atom D525 which has 2 cores and hyperthreading and here powernowd only affect cpu0 and cpu2.
I had a quick look at the source and I think this problem has to do with powernowd assuming cpus in the same scalable unit are consecutive.

I don't think that's the case on my system:

$ cat /sys/devices/system/cpu/cpu[0123]/cpufreq/affected_cpus
0 2
1 3
0 2
1 3

If I append '-c 1' to the powernowd options, i.e. force threads_per_core to be 1 it works ok but then I suspect it decides on and sets speed twice per scalable unit for every poll.

Best regards,
/Henrik

-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-3-rt-amd64 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages powernowd depends on:
ii  libc6  2.13-35

powernowd recommends no packages.

powernowd suggests no packages.

-- no debconf information