Messages in this thread |  | | | Date | Thu, 23 Jun 2005 15:11:52 -0700 (PDT) | | From | William Weston <> | | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 |
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On Thu, 23 Jun 2005, Ingo Molnar wrote:
> yes, very likely hardware (or system BIOS, e.g. SMM) induced.
Running -50-17 on the Xeon/HT box, now with the ICH5 USB controller disabled in BIOS.
The strangely regular ~200us idle jumps for both CPUs went away. Now I'm seeing one CPU at a time disappear (often completely absent) in the traces, with a the maximum wakeup generally hitting between 150us and 300us. While compiling a kernel and running vlc (which would skip frames like mad, even with RR scheduling) I was able to get one trace of 2556us.
There's also BUG warnings for update_out_trace(). I'm not quite sure if the trace behavior I'm seeing is related to this bug, but judging by the behavior of vlc, I wouldn't bet on it.
Since the 2556us trace is quite large all the info is posted at:
http://sysex.net/testing/2.6.12-RT-V0.7.50-17/xeonht/
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