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Date:      Mon, 28 Oct 2013 13:28:44 +0400
From:      Slawa Olhovchenkov <slw@zxy.spb.ru>
To:        freebsd-current@freebsd.org, freebsd-fs@freebsd.org
Subject:   ZFS txg implementation flaw
Message-ID:  <20131028092844.GA24997@zxy.spb.ru>

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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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