https://bugzilla.kernel.org/show_bug.cgi?id=25252
Summary: Offline cpu prevents sibling core to go to deep sleep
state
Product: ACPI
Version: 2.5
Kernel Version: 2.6.37
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Processor
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected], [email protected]
Regression: No
Although with the patch from Bug 5471 offline cpu goes to deepest sleep state,
offline cpu prevents the sibling cpu to go the deepest sleep state. Here is
c-state duration percentages from turbostat ( I also add an .csv attachment in
case they doesn't look neat here)
For a 2 socket, 8 physical/16 logical core processor, all cores are online.
pkg core CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
0.09 1.91 2.27 0.15 1.72 98.04 9.93 75.00
0 0 0 0.50 1.80 2.27 0.55 2.43 96.53 9.93 74.99
0 0 8 0.24 1.83 2.27 0.81 2.43 96.53 9.93 74.99
0 1 1 0.06 1.97 2.27 0.20 0.00 99.74 9.93 74.99
0 1 9 0.18 2.12 2.27 0.08 0.00 99.74 9.93 74.99
0 2 2 0.03 2.04 2.27 0.04 0.00 99.93 9.93 74.98
0 2 10 0.04 1.99 2.27 0.03 0.00 99.93 9.93 74.98
0 3 3 0.02 2.08 2.27 0.01 0.00 99.97 9.93 74.98
0 3 11 0.01 1.96 2.27 0.02 0.00 99.97 9.93 74.98
1 0 4 0.17 2.13 2.27 0.10 11.37 88.36 9.93 75.02
1 0 12 0.05 2.04 2.27 0.22 11.37 88.36 9.93 75.02
1 1 5 0.04 1.72 2.27 0.08 0.00 99.88 9.93 75.02
1 1 13 0.03 1.62 2.27 0.09 0.00 99.88 9.93 75.02
1 2 6 0.02 1.82 2.27 0.05 0.00 99.93 9.93 75.02
1 2 14 0.03 1.76 2.27 0.04 0.00 99.93 9.93 75.02
1 3 7 0.01 1.84 2.27 0.02 0.00 99.97 9.93 75.02
1 3 15 0.00 1.74 2.27 0.02 0.00 99.98 9.93 75.02
After cpu15 is offlined, its sibling (cpu7) doesn't go to c-6
pkg core CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
0.21 1.90 2.27 1.22 6.74 91.83 75.48 0.00
0 0 0 0.93 1.75 2.27 2.19 0.60 96.29 75.48 0.00
0 0 8 0.30 1.79 2.27 2.81 0.60 96.29 75.48 0.00
0 1 1 0.16 2.05 2.27 0.53 0.00 99.31 75.48 0.00
0 1 9 0.50 2.19 2.27 0.18 0.00 99.31 75.48 0.00
0 2 2 0.06 2.00 2.27 1.17 0.00 98.77 75.48 0.00
0 2 10 0.06 1.95 2.27 1.17 0.00 98.77 75.48 0.00
0 3 3 0.03 2.08 2.27 2.07 0.00 97.90 75.48 0.00
0 3 11 0.04 2.08 2.27 2.07 0.00 97.90 75.48 0.00
1 0 4 0.47 1.87 2.27 2.43 0.00 97.10 75.48 0.00
1 0 12 0.14 1.87 2.27 2.76 0.00 97.10 75.48 0.00
1 1 5 0.17 1.97 2.27 0.36 0.00 99.47 75.48 0.00
1 1 13 0.14 1.86 2.27 0.40 0.00 99.47 75.48 0.00
1 2 6 0.05 1.91 2.27 0.07 0.00 99.88 75.48 0.00
1 2 14 0.03 1.80 2.27 0.09 0.00 99.88 75.48 0.00
1 3 7 0.01 1.93 2.27 0.01 99.98 0.00 75.48 0.00
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