On Fri, 11 Jan 2008, Ingo Molnar wrote: > * Andi Kleen <[EMAIL PROTECTED]> wrote: > > > Cached requires the cache line to be read first before you can write > > it. > > nonsense, and you should know it. It is perfectly possible to construct > fully written cachelines, without reading the cacheline first. MOVDQ is > SSE1 so on basically in every CPU today - and it is 16 byte aligned and > can generate full cacheline writes, _without_ filling in the cacheline > first.
did you mean to write MOVNTPS above? > Bulk ops (string ops, etc.) will do full cacheline writes too, > without filling in the cacheline. on intel with fast strings enabled yes. mind you intel gives hints in the documentation these operations don't respect coherence... and i asked about this when they posted their memory ordering paper but got no response. -dean -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
