Date: Sat, 9 Jan 2010 20:06:30 -0500 From: Garrett Moore <garrettmoore@gmail.com> To: freebsd-stable@freebsd.org Subject: Re: ZFS performance degradation over time Message-ID: <7346c5c61001091706m45a3a2a5k3ca8bb0c4bec5ea8@mail.gmail.com> In-Reply-To: <20100110005621.GA45015@icarus.home.lan> References: <7346c5c61001030842r7dc76199y51e4c1c90a3eea6e@mail.gmail.com> <hi2nsf$do5$1@ger.gmane.org> <7346c5c61001080831w375d158fu5b1996ee58cb0f8d@mail.gmail.com> <ed91d4a81001080940ybfe1a63nc13bee5bd3136984@mail.gmail.com> <2ae8edf31001091051l156cb57alf549cfe06f1c7197@mail.gmail.com> <7346c5c61001091640w1a0ffb5y3ffe97cb88c76436@mail.gmail.com> <20100110005621.GA45015@icarus.home.lan>
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Sure: [root@leviathan ~]# sysctl kstat.zfs.misc.arcstats kstat.zfs.misc.arcstats.hits: 32092629 kstat.zfs.misc.arcstats.misses: 1064835 kstat.zfs.misc.arcstats.demand_data_hits: 30542262 kstat.zfs.misc.arcstats.demand_data_misses: 848959 kstat.zfs.misc.arcstats.demand_metadata_hits: 1550367 kstat.zfs.misc.arcstats.demand_metadata_misses: 215876 kstat.zfs.misc.arcstats.prefetch_data_hits: 0 kstat.zfs.misc.arcstats.prefetch_data_misses: 0 kstat.zfs.misc.arcstats.prefetch_metadata_hits: 0 kstat.zfs.misc.arcstats.prefetch_metadata_misses: 0 kstat.zfs.misc.arcstats.mru_hits: 18329884 kstat.zfs.misc.arcstats.mru_ghost_hits: 114483 kstat.zfs.misc.arcstats.mfu_hits: 13762745 kstat.zfs.misc.arcstats.mfu_ghost_hits: 172573 kstat.zfs.misc.arcstats.deleted: 1735926 kstat.zfs.misc.arcstats.recycle_miss: 2076926 kstat.zfs.misc.arcstats.mutex_miss: 545 kstat.zfs.misc.arcstats.evict_skip: 532474 kstat.zfs.misc.arcstats.hash_elements: 6784 kstat.zfs.misc.arcstats.hash_elements_max: 14351 kstat.zfs.misc.arcstats.hash_collisions: 149862 kstat.zfs.misc.arcstats.hash_chains: 338 kstat.zfs.misc.arcstats.hash_chain_max: 4 kstat.zfs.misc.arcstats.p: 25819136 kstat.zfs.misc.arcstats.c: 107609280 kstat.zfs.misc.arcstats.c_min: 107609280 kstat.zfs.misc.arcstats.c_max: 860874240 kstat.zfs.misc.arcstats.size: 40148272 kstat.zfs.misc.arcstats.hdr_size: 1411072 kstat.zfs.misc.arcstats.l2_hits: 0 kstat.zfs.misc.arcstats.l2_misses: 0 kstat.zfs.misc.arcstats.l2_feeds: 0 kstat.zfs.misc.arcstats.l2_rw_clash: 0 kstat.zfs.misc.arcstats.l2_writes_sent: 0 kstat.zfs.misc.arcstats.l2_writes_done: 0 kstat.zfs.misc.arcstats.l2_writes_error: 0 kstat.zfs.misc.arcstats.l2_writes_hdr_miss: 0 kstat.zfs.misc.arcstats.l2_evict_lock_retry: 0 kstat.zfs.misc.arcstats.l2_evict_reading: 0 kstat.zfs.misc.arcstats.l2_free_on_write: 0 kstat.zfs.misc.arcstats.l2_abort_lowmem: 0 kstat.zfs.misc.arcstats.l2_cksum_bad: 0 kstat.zfs.misc.arcstats.l2_io_error: 0 kstat.zfs.misc.arcstats.l2_size: 0 kstat.zfs.misc.arcstats.l2_hdr_size: 0 kstat.zfs.misc.arcstats.memory_throttle_count: 10349 Additionally, from top: Mem: 2869M Active, 440M Inact, 479M Wired, 91M Cache, 418M Buf, 63M Free Getting <20MB/s combined read/write at this point (ie copying files from one directory to another, both source and destination on the zpool). On Sat, Jan 9, 2010 at 7:56 PM, Jeremy Chadwick <freebsd@jdc.parodius.com>wrote: > On Sat, Jan 09, 2010 at 07:40:53PM -0500, Garrett Moore wrote: > > If no-one has any questions, I'll try Artem's suggestion of wasting a > bunch > > of memory in Perl/Python and forcing some memory to be swapped out. (I > don't > > want to do it yet in case someone wants a specific number before I do > that). > > It would help if you could provide the entire output from: > > sysctl kstat.zfs.misc.arcstats > > -- > | Jeremy Chadwick jdc@parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP: 4BD6C0CB | > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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