https://bugzilla.kernel.org/show_bug.cgi?id=35722
Len Brown <l...@kernel.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |l...@kernel.org
Summary|failed cpu idle on one of |busy thread on idle core i7
|cores of i7 sandy bridge |
--- Comment #5 from Len Brown <l...@kernel.org> 2011-08-01 15:39:38 ---
The turbostat logs in comment #2 confirm that 2.6.37-rc4 was fine,
but that 2.6.38-rc4 and 2.6.39 have a logical processor 99% in c0,
which is preventing the use of deep idle states:
broken:
GenuineIntel 13 CPUID levels; family:model:stepping 0x6:2a:7 (6:42:7)
8 * 100 = 800 MHz max efficiency
20 * 100 = 2000 MHz TSC frequency
26 * 100 = 2600 MHz max turbo 4 active cores
26 * 100 = 2600 MHz max turbo 3 active cores
28 * 100 = 2800 MHz max turbo 2 active cores
29 * 100 = 2900 MHz max turbo 1 active cores
core CPU %c0 GHz TSC %c1 %c3 %c6 %c7 %pc2 %pc3 %pc6
%pc7
12.52 2.00 2.00 46.91 0.00 40.57 0.00 0.00 0.00 0.00
0.00
0 0 99.93 2.00 2.00 0.07 0.00 0.00 0.00 0.00 0.00 0.00
0.00
0 4 0.12 2.00 2.00 99.88 0.00 0.00 0.00 0.00 0.00 0.00
0.00
1 1 0.01 2.00 2.00 8.98 0.00 91.01 0.00 0.00 0.00 0.00
0.00
1 5 0.06 2.00 2.00 8.93 0.00 91.01 0.00 0.00 0.00 0.00
0.00
2 2 0.00 2.00 2.00 59.42 0.00 40.58 0.00 0.00 0.00 0.00
0.00
2 6 0.07 2.00 2.00 59.35 0.00 40.58 0.00 0.00 0.00 0.00
0.00
3 3 0.00 2.01 2.00 69.33 0.00 30.67 0.00 0.00 0.00 0.00
0.00
3 7 0.00 1.99 2.00 69.33 0.00 30.67 0.00 0.00 0.00 0.00
0.00
Curiously that busy processor is running at 2.0 GHz, the HFM
for the processor -- even though higher turbo bins are available.
I'm unable to reproduce this issue on my sandy-bridge:
[root@sandy tmp]# uname -a
Linux sandy 2.6.38.6-26.rc1.fc15.x86_64 #1 SMP Mon May 9 20:45:15 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux
[root@sandy tmp]# dmesg |grep idle
[ 0.000000] RCU dyntick-idle grace-period acceleration is enabled.
[ 0.005731] using mwait in idle threads.
[ 1.835687] intel_idle: MWAIT substates: 0x21120
[ 1.835689] intel_idle: v0.4 model 0x2A
[ 1.835690] intel_idle: lapic_timer_reliable_states 0xffffffff
[ 1.859572] ACPI: acpi_idle yielding to intel_idle
[ 1.961634] cpuidle: using governor ladder
[ 1.962117] cpuidle: using governor menu
[root@sandy tmp]# ./turbostat -v sleep 10
GenuineIntel 13 CPUID levels; family:model:stepping 0x6:2a:7 (6:42:7)
8 * 100 = 800 MHz max efficiency
23 * 100 = 2300 MHz TSC frequency
31 * 100 = 3100 MHz max turbo 4 active cores
31 * 100 = 3100 MHz max turbo 3 active cores
33 * 100 = 3300 MHz max turbo 2 active cores
34 * 100 = 3400 MHz max turbo 1 active cores
core CPU %c0 GHz TSC %c1 %c3 %c6 %c7 %pc2 %pc3 %pc6
%pc7
0.12 1.06 2.29 1.23 0.03 0.00 98.62 0.60 0.08 1.86
92.49
0 0 0.37 1.44 2.29 1.07 0.12 0.00 98.44 0.60 0.08 1.86
92.49
0 4 0.15 0.82 2.29 1.30 0.12 0.00 98.44 0.60 0.08 1.86
92.49
1 1 0.02 0.81 2.29 0.24 0.00 0.00 99.74 0.60 0.08 1.86
92.49
1 5 0.17 0.81 2.29 0.09 0.00 0.00 99.74 0.60 0.08 1.86
92.49
2 2 0.19 0.80 2.29 3.42 0.00 0.00 96.39 0.60 0.08 1.86
92.48
2 6 0.01 0.82 2.29 3.60 0.00 0.00 96.39 0.60 0.08 1.86
92.48
3 3 0.01 0.82 2.29 0.08 0.00 0.00 99.91 0.60 0.08 1.86
92.48
3 7 0.03 0.86 2.29 0.06 0.00 0.00 99.91 0.60 0.08 1.86
92.48
10.004346 sec
This doesn't look like an issue with the idle code to me --
it looks like something is actually running on your system
and the idle code is simply reflecting that.
can you reproduce this on v3.0?
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