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local async prefetch limit on 8x cache pool

hi .. was looking for some clarification, on the usage of APF limit on 8x default cache pool.

a. Theoretically, most of the buffer read/writes to the pool should be via APF, then why its default value is set to as low as 10%?

b. While startup, ASE tunes this pool (along with 2k pool) on default data cache, to 80% prefetch limit. What does it leave out, the rest 20% for?

thanks, Deepak

Edit1: b is specific to default data cache, specified that.

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