Messages in this thread | | | Date | Sun, 16 Jul 2006 03:56:36 +0200 | From | Pavel Machek <> | Subject | Re: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time |
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> On Thu, 2006-07-13 at 13:06 +0000, Pavel Machek wrote: > > Can you run two such tests *in parallel*? That seemed to break it > > really quickly. > parallel sounds fun, but I don't get it. Two machine or trying to go > online and offline at the same time? Firestorming two busy parallel
Trying to online and offline at the same time.
> while loops, one turning the core offline and the other online, did not > bring an oops so I guess this kernel is in the clear in that regard.
Better run two tight loops, each doing online; offline. I got reports it crashed machines before, but maybe it is solved.
> I can't get it to crash again and I am afraid that it crashed under an > old devel kernel. After another ~20 hour test with heavy freq changes > with the tscsync patch > > CPU 1: Syncing TSC to CPU 0. > CPU 1: synchronized TSC with CPU 0 (last diff 4 cycles, maxerr 499 > cycles) > ... > CPU 2: Syncing TSC to CPU 0. > CPU 2: synchronized TSC with CPU 0 (last diff -105 cycles, maxerr 600 > cycles) > ... > CPU 3: Syncing TSC to CPU 0. > CPU 3: synchronized TSC with CPU 0 (last diff -122 cycles, maxerr 1126 > cycles) > > > after 5 hours of no PowerNow! > > CPU 1: Syncing TSC to CPU 0. > CPU 1: synchronized TSC with CPU 0 (last diff -3 cycles, maxerr 598 > cycles) > ... > CPU 2: Syncing TSC to CPU 0. > CPU 2: synchronized TSC with CPU 0 (last diff -124 cycles, maxerr 1129 > cycles) > ... > CPU 3: Syncing TSC to CPU 0. > CPU 3: synchronized TSC with CPU 0 (last diff -124 cycles, maxerr 1127 > cycles) > > > huh?? I don't understand but it does not matter what I do or how long I > do it, the difference looks to always be about the same. > > -joachim > > >
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