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73416ba
(Get the code!)
The last two comments on this bug are contradictory. Checking powertop with the 2.6.38 kernel for natty versus earlier kernels shows for me that the *type* of kernel interrupt has changed but the number of them has not and has increased if anything. I think this bug is serious and getting worse and requires the attention of a kernel developer. It reflects badly on linux in general if power consumption is increasing markedly while performance is not markedly increasing at the same time (which appears the case on the phoronix benchmarks).
To solve this requires someone familiar with the kernel to report it on the kernel bugzilla. There has been some discussion of the issue on lmkl but it looks very inconclusive and low priority to me. I don't know why exactly.