Re: [libvirt] [RFC] finegrained disk driver options control
On Thu, Mar 16, 2017 at 05:26:26PM +0100, Kevin Wolf wrote:
Am 16.03.2017 um 16:52 hat Daniel P. Berrange geschrieben:
If you don't care about that at all, the optimal configuration in terms
of performance is to give qemu a cache large enough that the metadata of
the whole image fits in it. When setting cache-clean-interval, this
could actually be reasonable even for large images because the memory
wouldn't be used forever but just as long as the guest is submitting the
problematic I/O patterns - but it still means that temporarily qemu
could really use all of this memory.
Is there some easy algorithm that libvirt can use to determine the size
of the L2 tables, and thus report what the maximum useful cache size
would be ?
Regards,
Daniel
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