Messages in this thread | | | Date | Wed, 20 Apr 2011 15:12:31 -0400 | From | Don Zickus <> | Subject | Re: [RFC] x86, perf: high volume of events produces a flood of unknown NMIs |
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On Wed, Apr 20, 2011 at 10:47:51PM +0400, Cyrill Gorcunov wrote: > > Or perhaps we don't care about this because in the end perf can't even > > capture the data without spitting out a CPU Overload message. > > > > Thoughts? > > > > Hi Don, just a thought -- since pmi masks lvtpc we could read it and check if it's > masked or no, though I fear it is quite time consuming operation in compare with > frames :( (hmm, intel spec mentions only p4 and xeon as masking lvtpc)
Been there, tried that. It seems to be masked a large majority of the time, even when the NMIs don't appear to be back-to-back.
Cheers, Don
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