Messages in this thread | | | Date | Tue, 19 Aug 2008 09:48:46 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH 0 of 9] x86/smp function calls: convert x86 tlb flushes to use function calls [POST 2] |
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> Don't pay attention to that number. It's only the extra latency of a HT > context->HT context function call + tlb flush. Which means 1) the tlb > is shared anyway, so the extra flush is redundant, 2) they're not really > concurrent, 3) it's going down the single-cpu call, rather than the > multi-cpu one, 4) it's only measuring the latency for a particular tlb > flush, and doesn't take into account any throughput improvements the > extra queueing may add.
A lot of flushes are synchronous. See the rest of my email that you snipped.
-Andi
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