On Mon, 2012-06-11 at 03:20 -0400, Chris Frey wrote: > Hi, > > I'm curious if there are debug settings enabled in the unstable > kernel which might cause it to run slower than released kernels, > and if so, what those settings might be so I can recompile and > test, to eliminate it. No. > I'm running on a Dell Inspiron 630m laptop, with 1gig of RAM, > running the Gnome3 desktop. It is a pretty fresh sid install, > upgraded from a Squeeze CD install. I haven't installed any > fancy video drivers.... it's pretty stock. > > When I run the sid 3.2.x kernel, light browsing and typing > in a terminal window can keep the CPU at 50% consistently. > Sometimes it hovers around 90%. > > If I run the old Squeeze kernel, 2.6.32, which is still on > here from the upgrade, it can idle down to about 12% to maybe > 25%. > > Strangely, there is no one process that is taking up so much > power. It seems to be a kernel level thing. There have been some changes in CPU accounting recently which some people say cause the CPU usage to be overstated when the system is mostly idle. But that wouldn't explain: > The extra cpu activity really causes the machine to run hot, > so much so that it is unpleasant to use. I don't know why > just changing the kernel can affect this. > > I'm running stock squeeze and sid kernels. If I can provide > debug information to help track this down, please let me know. Get a list of CPU usage according to standard CPU accounting: $ top -b -n 1 > top.log Get more detail by running perf (from linux-tools-3.2): # perf record -a sleep 10 # perf report --stdio > perf.report Ben. -- Ben Hutchings Computers are not intelligent. They only think they are.
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