ZFS txg implementation flaw

[Slawa Olhovchenkov]

I can be wrong.
As I see ZFS cretate seperate thread for earch txg writing.
Also for writing to L2ARC.
As result -- up to several thousands threads created and destoyed per
second. And hundreds thousands page allocations, zeroing, maping
unmaping and freeing per seconds. Very high overhead.

In systat -vmstat I see totfr up to 600000, prcfr up to 200000.

Estimated overhead -- 30% of system time.

Can anybody implement thread and page pool for txg?