On Mon, Dec 21, 2009 at 12:44:17PM -0500, Gregory Haskins wrote: > > They should be relatively rare > > because obtaining good receive batching is pretty easy. > > Batching is poor mans throughput (its easy when you dont care about > latency), so we generally avoid as much as possible. > > > Considering > > these are lightweight exits (on the order of 1-2us), > > APIC EOIs on x86 are MMIO based, so they are generally much heavier than > that. I measure at least 4-5us just for the MMIO exit on my Woodcrest, > never mind executing the locking/apic-emulation code. > With x2apic EOIs are not MMIO any longer. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
