Ubuntu
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  1. Bug #638434
  2. Comment #10

Comment 10 for bug 638434

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Jason Barnett (tamagotono-deactivatedaccount) wrote :

OK, I did a bit of quick comparisons of the different workarounds and the power usage as reported in powertop.

nolapic: 11.2W 97% of it's time in c4wait, 97% running at 1Ghz

nohz=off: 11.6W 98% of it's time polling, 100% running at 1GHz

clocksource=jiffies: 12.6W 99.5% of it's time polling, 50% running at 1.6GHz, 50% running at 1GHz

BIOS option "always low" 11.2W 59% of it's time in c1wait, 36% in c4wait (always running at 1GHz)

These were taken with simply booting, logging in and running powertop then letting the readings settle for about 5 minutes. I did not touch the system during this time. It would be better to run while doing specific tasks, but that is harder to replicate and I just wanted some down-n-dirty numbers. I think I will be sticking with the nolapic kernel option.

Hope this helps a bit and that we can find a fix to make this information obsolete. :)