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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