Messages in this thread | | | Subject | Re: [RFC] x86-64: Use SSE for copy_page and clear_page | From | Andi Kleen <> | Date | Wed, 01 Jun 2005 09:48:17 +0200 |
| |
michael@optusnet.com.au writes: > > Key point: "using it". This normally involves writes to memory. Most > applications don't commonly read memory that they haven't previously > written to. (valgrind et al call that behaviour a "bug" :). > > Given that, I'd say you really don't want the page zero routines > touching the cache.
Writing on a modern CPU requires reading first too to get the rest of the cache line (provided you don't use write combing or uncached accesses)
-Andi - 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/
| |