Messages in this thread | | | Date | Thu, 16 Jun 2011 10:33:16 +0300 | Subject | Re: [ANNOUNCE] Native Linux KVM tool v2 | From | Pekka Enberg <> |
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Hi Ingo,
On Thu, Jun 16, 2011 at 10:24 AM, Ingo Molnar <mingo@elte.hu> wrote: > - executing AIO in the vcpu thread eats up precious vcpu execution > time: combined QCOW2 throughput would be limited by a single > core's performance, and any time spent on QCOW2 processing would > not be spent running the guest CPU. (In such a model we certainly > couldnt do more intelligent, CPU-intense storage solutions like on > the fly compress/decompress of QCOW2 data.)
Most image formats have optional on-the-fly compression/decompression so we'd need to keep the current I/O thread scheme anyway.
> I'd only consider KAIO it if it provides some *real* measurable > performance advantage of at least 10% in some important usecase. > A few percent probably wouldnt be worth it.
I've only been following AIO kernel development from the sidelines but I really haven't seen any reports of significant gains over read()/write() from a thread pool. Are there any such reports?
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