https://bugzilla.kernel.org/show_bug.cgi?id=17291
--- Comment #18 from James Le Cuirot <ch...@aura-online.co.uk> 2010-10-31
10:27:49 ---
Mystery solved, it seems. I checked the BIOS settings and found a deeply nested
page that I hadn't seen before, mostly relating to C-states. While none of the
options were disabled, all of them were on auto. I enabled most of them (all
but CPU EIST and Bi-Directional PROCHOT) and booted with
intel_idle.max_cstate=0. It now does seem to be using the other C-states.
# cat /sys/devices/system/cpu/cpu0/cpuidle/*/name
C0
C1
C2
C3
# turbostat
core CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
0.48 2.68 2.93 1.03 2.77 95.72 3.49 45.69
0 0 0.06 1.24 2.93 0.16 5.64 94.14 3.49 45.69
0 4 0.04 1.24 2.93 0.18 5.64 94.14 3.49 45.69
1 1 0.45 1.88 2.93 3.80 0.26 95.49 3.49 45.69
1 5 2.47 3.18 2.93 1.78 0.26 95.49 3.49 45.69
2 2 0.07 1.23 2.93 0.22 3.53 96.18 3.49 45.69
2 6 0.05 1.25 2.93 0.24 3.53 96.18 3.49 45.69
3 3 0.39 1.44 2.93 0.88 1.65 97.09 3.49 45.69
3 7 0.28 2.36 2.93 0.98 1.65 97.09 3.49 45.69
I don't know what "auto" really means here. Even the manual doesn't say under
what conditions these would actually be enabled. If you're curious, check page
40 of my motherboard manual.
http://download.gigabyte.ru/manual/mb_manual_ga-p55a-ud6_e.pdf
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