Date: Mon, 28 Oct 2013 10:45:02 -0700 From: aurfalien <aurfalien@gmail.com> To: Slawa Olhovchenkov <slw@zxy.spb.ru> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org Subject: Re: ZFS txg implementation flaw Message-ID: <0F1D571E-2806-4392-A5EC-BE66A3C92BF7@gmail.com> In-Reply-To: <20131028092844.GA24997@zxy.spb.ru> References: <20131028092844.GA24997@zxy.spb.ru>
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On Oct 28, 2013, at 2:28 AM, Slawa Olhovchenkov wrote: > 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? Would lowering vfs.zfs.txg.timeout be a way to tame or mitigate this? - aurf
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