* Idle core on overloaded CPU?
@ 2008-10-23 12:12 Carsten Aulbert
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From: Carsten Aulbert @ 2008-10-23 12:12 UTC (permalink / raw)
To: linux-kernel; +Cc: Henning Fehrmann
Hi,
on Intel X3220 CPU based systems (4 physical cores) I came across the
following thing (Debian etch, with vanilla kernel 2.6.25.9):
starting the following:
$ screen -d -m stress -c 2
$ nice -19 screen -d -m stress -c 4
This causes two cores to be 100% busy in user state and one core to be
busy in 100% nice state. However, the remaining core is idle. Even
watching it over longer stretches of time, the situation remains static.
I guess it's a kernel misconfiguration on my part (config available here:
https://n0.aei.uni-hannover.de/linux/kernel/config-2.6.25.9-nodes
), but if not could this be a scheduling bug?
Thanks for any hint
Cheers
Carsten
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