[Bug 191510] [zfs] ZFS doesn't use all available memory

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191510

--- Comment #6 from vsjcfm at gmail.com ---
(In reply to Steven Hartland from comment #4)
> Are you sure that its not reduced over time due to something high memory
> usage processes which now aren't running?
> 
> To check this reboot and check the values then.

Absolutely, this machine is just nginx fileserver, without any other tasks. I
can collect ARC graph if this information will be useful.


(In reply to Steven Hartland from comment #5)
> sysctl kstat.zfs.misc.arcstats would also be useful

kstat.zfs.misc.arcstats.hits: 6357561684
kstat.zfs.misc.arcstats.misses: 1754865888
kstat.zfs.misc.arcstats.demand_data_hits: 2247259288
kstat.zfs.misc.arcstats.demand_data_misses: 8782100
kstat.zfs.misc.arcstats.demand_metadata_hits: 2211824311
kstat.zfs.misc.arcstats.demand_metadata_misses: 8160603
kstat.zfs.misc.arcstats.prefetch_data_hits: 1283671663
kstat.zfs.misc.arcstats.prefetch_data_misses: 1737864288
kstat.zfs.misc.arcstats.prefetch_metadata_hits: 614806422
kstat.zfs.misc.arcstats.prefetch_metadata_misses: 58897
kstat.zfs.misc.arcstats.mru_hits: 1548194108
kstat.zfs.misc.arcstats.mru_ghost_hits: 10388582
kstat.zfs.misc.arcstats.mfu_hits: 3287889203
kstat.zfs.misc.arcstats.mfu_ghost_hits: 102318783
kstat.zfs.misc.arcstats.allocated: 1774678632
kstat.zfs.misc.arcstats.deleted: 1646058550
kstat.zfs.misc.arcstats.stolen: 1146219028
kstat.zfs.misc.arcstats.recycle_miss: 3101763
kstat.zfs.misc.arcstats.mutex_miss: 4427461
kstat.zfs.misc.arcstats.evict_skip: 284890938
kstat.zfs.misc.arcstats.evict_l2_cached: 188456702423040
kstat.zfs.misc.arcstats.evict_l2_eligible: 32054253667840
kstat.zfs.misc.arcstats.evict_l2_ineligible: 9169893205504
kstat.zfs.misc.arcstats.hash_elements: 18175960
kstat.zfs.misc.arcstats.hash_elements_max: 18488668
kstat.zfs.misc.arcstats.hash_collisions: 1127435975
kstat.zfs.misc.arcstats.hash_chains: 3877554
kstat.zfs.misc.arcstats.hash_chain_max: 24
kstat.zfs.misc.arcstats.p: 145378360667
kstat.zfs.misc.arcstats.c: 197771088957
kstat.zfs.misc.arcstats.c_min: 33203088384
kstat.zfs.misc.arcstats.c_max: 265624707072
kstat.zfs.misc.arcstats.size: 200751138272
kstat.zfs.misc.arcstats.hdr_size: 1329000768                                    
kstat.zfs.misc.arcstats.data_size: 194945960448                                 
kstat.zfs.misc.arcstats.other_size: 1720016232                                  
kstat.zfs.misc.arcstats.l2_hits: 558004136                                      
kstat.zfs.misc.arcstats.l2_misses: 1196861331                                   
kstat.zfs.misc.arcstats.l2_feeds: 4171054                                       
kstat.zfs.misc.arcstats.l2_rw_clash: 72326                                      
kstat.zfs.misc.arcstats.l2_read_bytes: 73002745243136                           
kstat.zfs.misc.arcstats.l2_write_bytes: 113011830327808                         
kstat.zfs.misc.arcstats.l2_writes_sent: 3913397                                 
kstat.zfs.misc.arcstats.l2_writes_done: 3913396                                 
kstat.zfs.misc.arcstats.l2_writes_error: 0                                      
kstat.zfs.misc.arcstats.l2_writes_hdr_miss: 117425
kstat.zfs.misc.arcstats.l2_evict_lock_retry: 91025
kstat.zfs.misc.arcstats.l2_evict_reading: 219
kstat.zfs.misc.arcstats.l2_free_on_write: 4702368
kstat.zfs.misc.arcstats.l2_abort_lowmem: 56
kstat.zfs.misc.arcstats.l2_cksum_bad: 18
kstat.zfs.misc.arcstats.l2_io_error: 0
kstat.zfs.misc.arcstats.l2_size: 1838076781056
kstat.zfs.misc.arcstats.l2_asize: 1838076145664
kstat.zfs.misc.arcstats.l2_hdr_size: 3164330456
kstat.zfs.misc.arcstats.l2_compress_successes: 144015
kstat.zfs.misc.arcstats.l2_compress_zeros: 0
kstat.zfs.misc.arcstats.l2_compress_failures: 0
kstat.zfs.misc.arcstats.l2_write_trylock_fail: 387445125
kstat.zfs.misc.arcstats.l2_write_passed_headroom: 134983793
kstat.zfs.misc.arcstats.l2_write_spa_mismatch: 59111238565
kstat.zfs.misc.arcstats.l2_write_in_l2: 850651818119
kstat.zfs.misc.arcstats.l2_write_io_in_progress: 847
kstat.zfs.misc.arcstats.l2_write_not_cacheable: 36478134670
kstat.zfs.misc.arcstats.l2_write_full: 2008530
kstat.zfs.misc.arcstats.l2_write_buffer_iter: 4171054
kstat.zfs.misc.arcstats.l2_write_pios: 3913397
kstat.zfs.misc.arcstats.l2_write_buffer_bytes_scanned: 27587228945605632
kstat.zfs.misc.arcstats.l2_write_buffer_list_iter: 225730988
kstat.zfs.misc.arcstats.l2_write_buffer_list_null_iter: 19832
kstat.zfs.misc.arcstats.memory_throttle_count: 0
kstat.zfs.misc.arcstats.duplicate_buffers: 0
kstat.zfs.misc.arcstats.duplicate_buffers_size: 0
kstat.zfs.misc.arcstats.duplicate_reads: 0

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