ZFS txg implementation flaw
Slawa Olhovchenkov
slw at zxy.spb.ru
Mon Oct 28 09:26:47 UTC 2013
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?
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