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>
>
> So no difference in needed memory, with or with extended_l2.
>
> but the l2-cache-size tuning is really something we should add in
> another patch I think ,for general performance with qcow2.
>>If we want to enable extended_l2=on, cluster_size=128k by default for
>>all new qcow2 image, I think we should do it together with an
>>increased
>>l2-cache-size then.
yes, qemu have dumped the default to 32MB 3 years ago (so it can handle
256GB qcow2 image).
I was expected with extended_l2=on reduce the number of l2 entry, so
reduce the needed memory, but it don't seem to be the case. (I have
wrote a message to the original author to see if it's normal))
>> But yes, should be its own patch. The above >>results
>>sound promising, but we'll need to test a bigger variety of
>>workloads.
>>If we don't find settings that improve most workloads, we can still
>>make
>>it configurable.
yes, I only have tested with local disk and 4k read/write, so I think
it should be tested more deeply, also on nfs and different blocksize
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