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Date: Thu, 23 Oct 2008 14:12:32 +0200 From: Carsten Aulbert <carsten.aulbert@....mpg.de> To: linux-kernel@...r.kernel.org CC: Henning Fehrmann <henning.fehrmann@....mpg.de> Subject: Idle core on overloaded CPU? 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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