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    SubjectRe: [discuss] Re: [PATCH] Allow all Opteron processors to change pstate at same time
    > 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
    >
    >
    >

    --
    Thanks, Sharp!
    -
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