Date: Thu, 07 Jun 2012 10:16:07 +0200 From: Momchil Ivanov <momchil@xaxo.eu> To: Erich <erichfreebsdlist@ovitrap.com> Cc: =?UTF-8?B?0JzQvtC80YfQuNC7INCY0LLQsNC90L4=?=, freebsd-stable@freebsd.org, =?UTF-8?B?0LI=?= <momchil@xaxo.eu> Subject: Re: ULE Scheduler Message-ID: <86ehprtu48.wl%momchil@xaxo.eu> In-Reply-To: <12782903.WNKlBIO9Im@x220.ovitrap.com> References: <86fwa8szos.wl%momchil@xaxo.eu> <12782903.WNKlBIO9Im@x220.ovitrap.com>
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At Thu, 07 Jun 2012 09:12:55 +0700, Erich wrote: > > Hi, > > On 07 June 2012 3:01:07 Момчил Иванов wrote: > > > 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? > > maybe, maybe not. It could be that the difference is minor as the cache for both kernels is in the same chip. > > > > 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. > > This would be the interesting point? Did it happen because of the dirt or because or the scheduler. > > > > Is there some remedy? > > I think that the only remedy available is the one you applied. > > Erich > I've repeated the same experiment just now, setting both processes on both cores with cpuset. The temperature got to about 72-74 C, so the two small pieces of dirt that came out, the fresh thermal liquid and tightening the screws probably gave me 10 about C on idle (from 53 C down to 45 C) and 30 C on full load. I didn't expect that much... Though, it was strange seeing both processes hopping around... I will probably go back to the 4BSD scheduler if my laptop does another self-shutdown in the next few days as Doug suggested. Regards, Momchil
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