Messages in this thread | | | Subject | Re: [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support | From | Benjamin Herrenschmidt <> | Date | Tue, 28 Sep 2004 08:54:04 +1000 |
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On Tue, 2004-09-28 at 06:05, Albert Cahalan wrote: > Benjamin Herrenschmidt writes: > > > Be careful that some G4's have a bug which can cause a > > perf monitor interrupt to crash your kernel :( Basically, the > > problem is if any of TAU or PerfMon interrupt happens at the > > same time as a DEC interrupt, some revs of the CPU can get > > confused and lose the previous exception state. > > Instead of excluding all these CPUs, simply put the > clock tick on the PerfMon interrupt. There's a bit-flip > that'll go at about 4 kHz on a system with a 100 MHz bus. > That should do. One need not change HZ; the interrupt > can be ignored whenever the timebase hasn't advanced > enough to require another clock tick.
True, we can use the perfmon instead of the DEC for those
Ben.
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