I have a Dell Latitude E6410 with i7 processor (4x Intel(R) Core(TM) i7
CPU M 620 ). I am running Ubuntu 10.04.1 LTS, after reading above (and
also https://bugzilla.kernel.org/show_bug.cgi?id=15064 ) I updated the
kernel to "Linux 2.6.35-020635rc1-generic (x86_64)", I have a rather
strange behaviour: if I keep my AC power cord pluged in all cores stay
fixed at 1.2Ghz (minimum speed), If I remove the power cord they
"sometimes" (meaning that the behaviour does not seem "deterministic")
they jump to higher speed values (but never to the maximum possible
speed).
this is what I see using Turbostat with power cord IN (while running make on a
large program)
cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
11.54 1.20 2.66 43.67 9.83 34.97 6.01 11.02
0 0 5.83 1.21 2.66 56.73 5.15 32.30 6.01 11.02
0 2 30.01 1.20 2.66 32.54 5.15 32.30 6.01 11.02
2 1 5.75 1.21 2.66 42.11 14.51 37.63 6.01 11.02
2 3 4.56 1.22 2.66 43.30 14.51 37.63 6.01 11.02
cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
24.05 1.20 2.66 48.51 8.22 19.22 0.00 0.00
0 0 6.66 1.20 2.66 70.43 5.25 17.66 0.00 0.00
0 2 46.43 1.20 2.66 30.66 5.25 17.66 0.00 0.00
2 1 21.50 1.20 2.66 46.53 11.20 20.78 0.00 0.00
2 3 21.62 1.20 2.66 46.40 11.20 20.78 0.00 0.00
cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
23.71 1.20 2.66 46.22 8.76 21.31 0.00 0.00
0 0 7.08 1.20 2.66 50.27 12.23 30.42 0.00 0.00
0 2 26.57 1.20 2.66 30.78 12.23 30.42 0.00 0.00
2 1 35.55 1.20 2.66 46.96 5.29 12.20 0.00 0.00
2 3 25.63 1.20 2.66 56.88 5.29 12.20 0.00 0.00
and this is what I get with power cord out
cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
18.82 2.10 2.66 47.81 7.21 26.16 4.90 6.22
0 0 26.06 2.10 2.66 43.97 8.18 21.79 4.90 6.22
0 2 28.85 2.10 2.66 41.18 8.18 21.79 4.90 6.22
2 1 8.88 2.11 2.66 54.34 6.24 30.53 4.90 6.22
2 3 11.50 2.12 2.66 51.72 6.24 30.53 4.90 6.22
cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
27.29 2.13 2.66 50.30 3.60 18.81 0.00 0.00
0 0 16.80 2.13 2.66 83.20 0.00 0.00 0.00 0.00
0 2 86.23 2.13 2.66 13.77 0.00 0.00 0.00 0.00
2 1 3.43 2.13 2.66 51.74 7.20 37.62 0.00 0.00
2 3 2.70 2.13 2.66 52.48 7.20 37.62 0.00 0.00
cor CPU %c0 GHz TSC %c1 %c3 %c6 %pc3 %pc6
19.92 2.12 2.66 49.84 4.25 25.98 0.39 5.11
0 0 68.50 2.13 2.66 20.93 0.96 9.61 0.39 5.11
0 2 4.75 2.09 2.66 84.68 0.96 9.61 0.39 5.11
2 1 3.35 2.10 2.66 46.74 7.54 42.36 0.39 5.11
2 3 3.10 2.10 2.66 47.00 7.54 42.36 0.39 5.11
It seems to me that there are still some issues with I7 mobile
processors (btw, I also have a NON mobile i7 920 at home that does not
seem to give me any problem with standard Ubuntu 9.10) ....
--
core i7 i5 (Lynnfield) turbo boost not working
https://bugs.launchpad.net/bugs/429036
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