Messages in this thread | | | Date | Tue, 22 Dec 2009 09:22:13 +0200 | From | Gleb Natapov <> | Subject | Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33 |
| |
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.
| |