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Doublewrite block number in XtraDB



In XtraDB, if we adjust the size of doublewrite buffer and relative
variable (i.e. srv_doublewrite_batch_size) , in theory, we can get better
throughput when buffer pool flush to disk.

I wonder that why doublewrite buffer size is 2 block and each flush page
number is 120 (decided by srv_doublewrite_batch_size), instead doublewrite
size is 8 and each flush page number is 500 or more?
Is it worry about that when doing flush will occupy too much resource or
other reason?

Best Regard
Hank Lyu

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