Messages in this thread | | | Subject | Re: [PATCH][2.6.9-rc2-mm3] perfctr ppc32 preliminary interrupt support | From | Benjamin Herrenschmidt <> | Date | Mon, 27 Sep 2004 10:36:42 +1000 |
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On Mon, 2004-09-27 at 10:25, Mikael Pettersson wrote: > On Mon, 27 Sep 2004 09:49:45 +1000, Benjamin Herrenschmidt wrote: > > 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. > > Oh I'm very much aware of that erratum. That's why I never > even tried implementing this while I only had a 750/G3. > The error appears to affect all classic 750s, all 7400s, > and early 7410s. Late 7410s and all 744x/745x are Ok. > I don't know if IBM's recent 750s (GX/FX) have the error, > but their 750CXs do.
Oh, interesting... I wasn't sure about the G3s, though iirc, we discovered the error in the first place with MOL on an old G3 indeed...
Ben.
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