Date: Fri, 29 Oct 2010 20:14:07 +0400 From: "Alexander Zagrebin" <alexz@visp.ru> To: "'Jeremy Chadwick'" <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org Subject: RE: 8.1-STABLE: zfs and sendfile: problem still exists Message-ID: <427A82F90F9C484F8022369EAB690830@vosz.local> In-Reply-To: <20101029145237.GA78583@icarus.home.lan> References: <3D1C350B94A44E5D95BAA1596D1EBF13@vosz.local><4CCABF73.8070707@icyb.net.ua><F28DAE02F7C94D25B0D86E3D27006C8B@vosz.local><4CCACDC0.7050802@icyb.net.ua><1BDB4D1B02274CC8AA2DD5E68190CB5D@vosz.local> <20101029145237.GA78583@icarus.home.lan>
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> > Can you reproduce the problem on your system? > > I can't reproduce it on mine. Note the resilvering was induced from > some unrelated disk swaps/tests I was performing, and ftpd is already > enabled via inetd on this system. > > What ZFS tunings have you applied to your system? Can you provide > output from "sysctl -a kstat.zfs.misc.arcstats" before and after a > transfer which exhibits the initial slowdown? It's amd64 Intel Atom based system with 2G RAM. /boot/loader.conf contains nothing special: vm.kmem_size="1536M" vfs.zfs.prefetch_disable="1" $ dd if=/dev/random of=test bs=1m count=50; sysctl -a kstat.zfs.misc.arcstats; fetch -o /dev/null http://localhost/test; sysctl -a kstat.zfs.misc.arcstats 50+0 records in 50+0 records out 52428800 bytes transferred in 2.956783 secs (17731705 bytes/sec) kstat.zfs.misc.arcstats.hits: 10889409 kstat.zfs.misc.arcstats.misses: 2482562 kstat.zfs.misc.arcstats.demand_data_hits: 7920924 kstat.zfs.misc.arcstats.demand_data_misses: 1587278 kstat.zfs.misc.arcstats.demand_metadata_hits: 2968455 kstat.zfs.misc.arcstats.demand_metadata_misses: 895284 kstat.zfs.misc.arcstats.prefetch_data_hits: 0 kstat.zfs.misc.arcstats.prefetch_data_misses: 0 kstat.zfs.misc.arcstats.prefetch_metadata_hits: 30 kstat.zfs.misc.arcstats.prefetch_metadata_misses: 0 kstat.zfs.misc.arcstats.mru_hits: 5596211 kstat.zfs.misc.arcstats.mru_ghost_hits: 199040 kstat.zfs.misc.arcstats.mfu_hits: 5293198 kstat.zfs.misc.arcstats.mfu_ghost_hits: 481006 kstat.zfs.misc.arcstats.allocated: 2985083 kstat.zfs.misc.arcstats.deleted: 1901535 kstat.zfs.misc.arcstats.stolen: 1269643 kstat.zfs.misc.arcstats.recycle_miss: 464100 kstat.zfs.misc.arcstats.mutex_miss: 658 kstat.zfs.misc.arcstats.evict_skip: 148879 kstat.zfs.misc.arcstats.evict_l2_cached: 0 kstat.zfs.misc.arcstats.evict_l2_eligible: 150609301504 kstat.zfs.misc.arcstats.evict_l2_ineligible: 36864 kstat.zfs.misc.arcstats.hash_elements: 91782 kstat.zfs.misc.arcstats.hash_elements_max: 168546 kstat.zfs.misc.arcstats.hash_collisions: 2058158 kstat.zfs.misc.arcstats.hash_chains: 23888 kstat.zfs.misc.arcstats.hash_chain_max: 18 kstat.zfs.misc.arcstats.p: 807441359 kstat.zfs.misc.arcstats.c: 1006632960 kstat.zfs.misc.arcstats.c_min: 125829120 kstat.zfs.misc.arcstats.c_max: 1006632960 kstat.zfs.misc.arcstats.size: 1006690472 kstat.zfs.misc.arcstats.hdr_size: 20252216 kstat.zfs.misc.arcstats.data_size: 917198336 kstat.zfs.misc.arcstats.other_size: 69239920 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_read_bytes: 0 kstat.zfs.misc.arcstats.l2_write_bytes: 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: 9 kstat.zfs.misc.arcstats.l2_write_trylock_fail: 0 kstat.zfs.misc.arcstats.l2_write_passed_headroom: 0 kstat.zfs.misc.arcstats.l2_write_spa_mismatch: 0 kstat.zfs.misc.arcstats.l2_write_in_l2: 0 kstat.zfs.misc.arcstats.l2_write_io_in_progress: 0 kstat.zfs.misc.arcstats.l2_write_not_cacheable: 30 kstat.zfs.misc.arcstats.l2_write_full: 0 kstat.zfs.misc.arcstats.l2_write_buffer_iter: 0 kstat.zfs.misc.arcstats.l2_write_pios: 0 kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned: 0 kstat.zfs.misc.arcstats.l2_write_buffer_list_iter: 0 kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter: 0 /dev/null 100% of 50 MB 119 kBps 00m00s kstat.zfs.misc.arcstats.hits: 10928358 kstat.zfs.misc.arcstats.misses: 2486504 kstat.zfs.misc.arcstats.demand_data_hits: 7959052 kstat.zfs.misc.arcstats.demand_data_misses: 1590868 kstat.zfs.misc.arcstats.demand_metadata_hits: 2969276 kstat.zfs.misc.arcstats.demand_metadata_misses: 895636 kstat.zfs.misc.arcstats.prefetch_data_hits: 0 kstat.zfs.misc.arcstats.prefetch_data_misses: 0 kstat.zfs.misc.arcstats.prefetch_metadata_hits: 30 kstat.zfs.misc.arcstats.prefetch_metadata_misses: 0 kstat.zfs.misc.arcstats.mru_hits: 5601378 kstat.zfs.misc.arcstats.mru_ghost_hits: 199211 kstat.zfs.misc.arcstats.mfu_hits: 5326980 kstat.zfs.misc.arcstats.mfu_ghost_hits: 482037 kstat.zfs.misc.arcstats.allocated: 2989914 kstat.zfs.misc.arcstats.deleted: 1904492 kstat.zfs.misc.arcstats.stolen: 1272047 kstat.zfs.misc.arcstats.recycle_miss: 464306 kstat.zfs.misc.arcstats.mutex_miss: 658 kstat.zfs.misc.arcstats.evict_skip: 148880 kstat.zfs.misc.arcstats.evict_l2_cached: 0 kstat.zfs.misc.arcstats.evict_l2_eligible: 150970209280 kstat.zfs.misc.arcstats.evict_l2_ineligible: 36864 kstat.zfs.misc.arcstats.hash_elements: 92084 kstat.zfs.misc.arcstats.hash_elements_max: 168546 kstat.zfs.misc.arcstats.hash_collisions: 2062370 kstat.zfs.misc.arcstats.hash_chains: 23974 kstat.zfs.misc.arcstats.hash_chain_max: 18 kstat.zfs.misc.arcstats.p: 810895823 kstat.zfs.misc.arcstats.c: 1006632960 kstat.zfs.misc.arcstats.c_min: 125829120 kstat.zfs.misc.arcstats.c_max: 1006632960 kstat.zfs.misc.arcstats.size: 1006658848 kstat.zfs.misc.arcstats.hdr_size: 20246240 kstat.zfs.misc.arcstats.data_size: 917672960 kstat.zfs.misc.arcstats.other_size: 68739648 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_read_bytes: 0 kstat.zfs.misc.arcstats.l2_write_bytes: 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: 9 kstat.zfs.misc.arcstats.l2_write_trylock_fail: 0 kstat.zfs.misc.arcstats.l2_write_passed_headroom: 0 kstat.zfs.misc.arcstats.l2_write_spa_mismatch: 0 kstat.zfs.misc.arcstats.l2_write_in_l2: 0 kstat.zfs.misc.arcstats.l2_write_io_in_progress: 0 kstat.zfs.misc.arcstats.l2_write_not_cacheable: 30 kstat.zfs.misc.arcstats.l2_write_full: 0 kstat.zfs.misc.arcstats.l2_write_buffer_iter: 0 kstat.zfs.misc.arcstats.l2_write_pios: 0 kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned: 0 kstat.zfs.misc.arcstats.l2_write_buffer_list_iter: 0 kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter: 0 -- Alexander Zagrebin
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