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SubjectRe: 50 Watt idle power regression bisected to Linux-3.10
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On Sun, 2013-12-08 at 15:40 -0500, Len Brown wrote: 
> > FWIW, my little x3550 (E5620) box is spending ~99% of its time in C3 per
> > powertop, deepest state it has.
>
> Please run turbostat, which always describes what the hardware does.
> Depending on the version of powertop and the hardware involved,
> it may be describing that the OS requested -- which is not always the same.
>
> The hardware reserves the right to demote any requested C-state to a
> shallower one. Also, it is the hardware decision whether to promote
> core c-states requested by the OS into power saving package C-states.

Hrm, turbostat says rtbox has a C6, and is using it. Ah, BIOS says ACPI
C3 == Intel C6, so I suppose Intel C3 == ACPI C2. Whatever, both tools
seem to agree that these particular boxen (x3550/E5620 and DL980/X7560)
are snoozing peacefully.

rtbox:~ # turbostat -i 60
cor CPU %c0 GHz TSC SMI %c1 %c3 %c6 CTMP %pc3 %pc6
0.18 1.73 2.40 0 0.19 0.02 99.61 25 0.08 92.74
0 0 0.47 1.60 2.40 0 0.62 0.08 98.83 18 0.08 92.74
1 1 0.03 1.61 2.40 0 0.05 0.00 99.92 25
9 2 0.05 1.73 2.40 0 0.06 0.00 99.89 16
10 3 0.15 2.13 2.40 0 0.05 0.01 99.79 20

vogelweide:~/:[0]# turbostat -i 60
pk cor CPU %c0 GHz TSC SMI %c1 %c3 %c6 CTMP %pc3 %pc6
0.06 2.03 2.26 0 0.76 99.18 0.00 49 94.97 0.00
0 0 0 0.40 1.57 2.26 3 25.28 74.32 0.00 49 64.24 0.00
0 1 1 0.08 2.16 2.26 3 19.28 80.64 0.00 48
0 2 2 0.09 2.20 2.26 3 0.00 99.91 0.00 49
0 3 3 0.09 2.20 2.26 3 0.00 99.91 0.00 49
0 8 4 0.08 2.21 2.26 3 0.00 99.91 0.00 45
0 9 5 0.08 2.22 2.26 3 0.00 99.92 0.00 46
0 10 6 0.08 2.23 2.26 3 0.00 99.92 0.00 45
0 11 7 0.08 2.23 2.26 3 0.00 99.92 0.00 45
1 0 8 0.10 1.94 2.26 3 0.01 99.89 0.00 38 99.88 0.00
1 1 9 0.08 2.11 2.26 3 0.00 99.92 0.00 39
1 2 10 0.08 2.12 2.26 3 0.00 99.92 0.00 41
1 3 11 0.07 2.14 2.26 3 0.00 99.92 0.00 41
1 8 12 0.08 2.15 2.26 3 0.00 99.92 0.00 42
1 9 13 0.07 2.17 2.26 3 0.00 99.92 0.00 43
1 10 14 0.07 2.19 2.26 3 0.00 99.92 0.00 41
1 11 15 0.07 2.20 2.26 3 0.00 99.93 0.00 41
2 0 16 0.09 1.93 2.26 3 0.01 99.90 0.00 41 99.89 0.00
2 1 17 0.07 2.09 2.26 3 0.00 99.92 0.00 40
2 2 18 0.07 2.11 2.26 3 0.00 99.93 0.00 41
2 3 19 0.07 2.12 2.26 3 0.00 99.93 0.00 42
2 8 20 0.07 2.14 2.26 3 0.00 99.93 0.00 41
2 9 21 0.07 2.16 2.26 3 0.00 99.93 0.00 41
2 10 22 0.07 2.17 2.26 3 0.00 99.93 0.00 37
2 11 23 0.07 2.20 2.26 3 0.00 99.93 0.00 39
3 0 24 0.08 1.91 2.26 3 0.01 99.91 0.00 41 99.88 0.00
3 1 25 0.06 2.07 2.26 3 0.00 99.93 0.00 42
3 2 26 0.07 2.09 2.26 3 0.02 99.92 0.00 41
3 3 27 0.06 2.11 2.26 3 0.00 99.94 0.00 42
3 8 28 0.06 2.12 2.26 3 0.00 99.94 0.00 47
3 9 29 0.06 2.15 2.26 3 0.00 99.94 0.00 46
3 10 30 0.06 2.18 2.26 3 0.00 99.94 0.00 44
3 11 31 0.06 2.19 2.26 3 0.02 99.92 0.00 46
4 0 32 0.07 1.92 2.26 3 0.01 99.92 0.00 36 96.25 0.00
4 1 33 0.06 2.07 2.26 3 0.00 99.94 0.00 36
4 2 34 0.06 2.08 2.26 3 0.00 99.94 0.00 39
4 3 35 0.05 2.11 2.26 3 0.00 99.94 0.00 39
4 8 36 0.05 2.12 2.26 3 3.67 96.28 0.00 40
4 9 37 0.05 2.15 2.26 3 0.00 99.94 0.00 42
4 10 38 0.05 2.18 2.26 3 0.00 99.95 0.00 39
4 11 39 0.05 2.20 2.26 3 0.00 99.95 0.00 40
5 0 40 0.07 1.73 2.26 3 0.02 99.91 0.00 35 99.90 0.00
5 1 41 0.05 2.00 2.26 3 0.00 99.95 0.00 36
5 2 42 0.05 2.04 2.26 3 0.00 99.95 0.00 39
5 3 43 0.04 2.04 2.26 3 0.00 99.95 0.00 38
5 8 44 0.05 2.09 2.26 3 0.00 99.95 0.00 40
5 9 45 0.04 2.10 2.26 3 0.00 99.95 0.00 41
5 10 46 0.04 2.13 2.26 3 0.00 99.96 0.00 37
5 11 47 0.04 2.17 2.26 3 0.00 99.96 0.00 37
6 0 48 0.08 1.61 2.26 3 0.02 99.90 0.00 35 99.87 0.00
6 1 49 0.05 1.79 2.26 3 0.01 99.94 0.00 36
6 2 50 0.04 1.98 2.26 3 0.00 99.96 0.00 36
6 3 51 0.04 2.00 2.26 3 0.00 99.96 0.00 37
6 8 52 0.04 2.01 2.26 3 0.00 99.96 0.00 38
6 9 53 0.03 2.07 2.26 3 0.00 99.96 0.00 36
6 10 54 0.03 2.08 2.26 3 0.00 99.96 0.00 36
6 11 55 0.03 2.14 2.26 3 0.00 99.96 0.00 36
7 0 56 0.05 1.69 2.26 3 0.01 99.94 0.00 41 99.89 0.00
7 1 57 0.03 1.87 2.26 3 0.00 99.97 0.00 41
7 2 58 0.03 1.89 2.26 3 0.00 99.97 0.00 44
7 3 59 0.03 1.93 2.26 3 0.00 99.97 0.00 44
7 8 60 0.03 1.97 2.26 3 0.05 99.92 0.00 41
7 9 61 0.03 2.02 2.26 3 0.00 99.97 0.00 38
7 10 62 0.02 2.06 2.26 3 0.00 99.97 0.00 39
7 11 63 0.03 2.12 2.26 3 0.00 99.97 0.00 36



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