Date: Thu, 07 Jun 2012 03:01:07 +0200 From: =?UTF-8?B?0JzQvtC80YfQuNC7INCY0LLQsNC90L7Qsg==?= <momchil@xaxo.eu> To: freebsd-stable@freebsd.org Subject: ULE Scheduler Message-ID: <86fwa8szos.wl%momchil@xaxo.eu>
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Hi, today I had a really strange experience with my laptop. I ran 2 lisp processes each consuming 100% CPU (i.e. in top, 100% CPU means one full core), since I have 2 cores, it means full processor load. I was moreover running Emacs and Opera, but that is more or less irrelevant since they consume negligible amount of CPU time. At some point my Xorg died and I was dropped in the terminal and the first thought through my mind was that my laptop just said "goodbye, it was nice meeting you after 4+ years". A second later I saw: Jun 7 01:00:06 t61 kernel: acpi_tz1: WARNING - current temperature (100.1C) exceeds safe limits which was a sign of relief: "oh, maybe the fan got busted...". So I took a screw driver and disassembled my Lenovo T61. Cleaning all the dust and putting a fresh amount of thermal fluid (did it 1 year ago), I booted again and started both processes again and took a look at the temperature. It was constantly increasing from about 33 C. I took a look at top and saw that both processes were wildly jumping accross the cores, i.e. CPU0 and CPU1. So before reading all the papers about the ULE scheduler and the source code, I would like to as a simple question: is it that stupid? I mean, there are just 2 processes running (except of top, X and ... which should be scheduled occasionally) on 2 cores of one physical processor. Why sould each be scheduled on a different core each time? I did cpuset to pin each to a specific core and got to about a constant temperature of 72 C. I am affraid to "cpuset -l 0,1 -p <...>" both of them since I might again get at 100 C. Is there some remedy? Please CC me, since I am not subscribed to the list. Regards, Momchil
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