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powertop reports 0% package c-states on i7-8850H
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Anton Gubarkov
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Joined: 13 Mar 2008
Posts: 52

PostPosted: Fri Nov 15, 2019 9:04 am    Post subject: powertop reports 0% package c-states on i7-8850H Reply with quote

I'm trying to bring down the appetite my power-hungry T52. I fired powertop and I could see that the package never reaches any of the c-states. Is it a defect of powertop? Or I miss something in the kernel config?

Code:



           Pkg(HW)  |            Core(HW) |            CPU(OS) 0   CPU(OS) 6
                    |                     | C0 active   3,4%        4,6%
                    |                     | POLL        0,0%    0,0 ms  0,0%    0,0 ms
                    |                     | C1          0,0%    0,0 ms  0,0%    0,0 ms
C2 (pc2)    0,0%    |                     |
C3 (pc3)    0,0%    | C3 (cc3)    0,2%    | C3          0,2%    0,1 ms  0,2%    0,1 ms
C6 (pc6)    0,0%    | C6 (cc6)    7,5%    | C6          5,9%    0,6 ms  3,8%    0,4 ms
C7 (pc7)    0,0%    | C7 (cc7)   73,3%    | C7s         0,0%    0,0 ms  0,0%    0,0 ms
C8 (pc8)    0,0%    |                     | C8         21,2%    0,9 ms 14,3%    0,9 ms
C9 (pc9)    0,0%    |                     | C9         22,8%    2,8 ms  2,2%    2,8 ms
C10 (pc10)  0,0%    |                     |
                    |                     | C10        42,5%    2,8 ms 70,6%    4,3 ms
                    |                     | C1E         0,1%    0,2 ms  0,2%    0,1 ms
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Anton Gubarkov
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Joined: 13 Mar 2008
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PostPosted: Tue Nov 19, 2019 1:08 pm    Post subject: Reply with quote

found a bug that describes exactly this behaviour:
https://bugs.freedesktop.org/show_bug.cgi?id=112315
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