Re: [GIT PULL] AlacrityVM guest drivers for 2.6.33

From: Gleb Natapov
Date: Tue Dec 22 2009 - 02:23:10 EST

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.

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