On Wed, 26 Apr 2006, Brent Casavant wrote: > Note that wmb() is not sufficient for writes, at least on SGI Altix. > wmb() ensures that the write has issued from the processor, however > it does not ensure that the I/O device itself has seen the write. > The mmiowb() is the appropriate call to ensure that the write has > been seen. Oh, and lest I confuse anyone, wmb() is sufficient for writes to RAM. It's only I/O writes for which it is insufficient. Brent -- Brent Casavant All music is folk music. I ain't bcasavan@xxxxxxx never heard a horse sing a song. Silicon Graphics, Inc. -- Louis Armstrong - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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