Messages in this thread | | | Date | Thu, 29 Jun 2006 14:03:11 +0200 | From | Bart Hartgers <> | Subject | Re: [PATCH] (Longhaul 1/5) PCI: Protect bus master DMA from Longhaul by rw semaphores |
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Alan Cox wrote: > Ar Mer, 2006-06-28 am 20:25 +0200, ysgrifennodd Rafał Bilski: >> AUTOHALT, this means interrupts must be disabled except for the time tick, >> which should be reset to >=1ms. Care must be taken to avoid other system events >> that could interfere with this operation. A few examples are snooping, NMI, >> INIT, SMI and FLUSH." > > "snooping". So we do need the cache sorting out. >
If I understand correctly, trouble occurs when the processor tries to snoop? Would disabling (via MSR) and flushing the caches before changing the frequency help in that case?
Groeten, Bart
-- Bart Hartgers - TUE Eindhoven - http://plasimo.phys.tue.nl/bart/contact/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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