[Bug 30557] Re: cpu idle time in /proc/stat wrong

[Matthew Garrett]

> Note that this workaround causes a performance hit in my cpu-intensive
apps, so it's > not really an acceptable solution.

No it doesn't. C states are power saving states - limiting the maximum C
state will have a marginal improvement on performance, and certainly not
a hit.

Ben, this sounds like something mad like the jiffies counter not being
increased in C3 and C4 states. Can you take a quick look at the code
there?

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cpu idle time in /proc/stat wrong
https://launchpad.net/bugs/30557