[Bug 187594] [zfs] [patch] ZFS ARC behavior problem and fix

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594

--- Comment #23 from karl at denninger.net ---
Status -- still grinning, still doing what it's supposed to on my
fairly-heavily loaded production machine.....  This machine has a large
Postgres database running on it and has 19Gb of RAM wired at the present time.

Are there any further comments from the reviewers on integration into the tree
for general distribution?

[karl at NewFS ~]$ uname -v
FreeBSD 10.0-STABLE #0 r265164M: Wed Apr 30 16:55:42 CDT 2014    
karl at NewFS.denninger.net:/usr/obj/usr/src/sys/KSD-SMP 

[karl at NewFS ~]$ uptime
10:24AM  up 111 days, 16:56, 1 user, load averages: 0.43, 0.55, 0.51

[karl at NewFS ~]$ zfs-stats -AE

------------------------------------------------------------------------
ZFS Subsystem Report                            Wed Aug 20 10:24:49 2014
------------------------------------------------------------------------

ARC Summary: (HEALTHY)
        Memory Throttle Count:                  0

ARC Misc:
        Deleted:                                146.88m
        Recycle Misses:                         6.59m
        Mutex Misses:                           14.19k
        Evict Skips:                            176.63m

ARC Size:                               65.19%  14.56   GiB
        Target Size: (Adaptive)         65.19%  14.56   GiB
        Min Size (Hard Limit):          12.50%  2.79    GiB
        Max Size (High Water):          8:1     22.33   GiB

ARC Size Breakdown:
        Recently Used Cache Size:       78.62%  11.44   GiB
        Frequently Used Cache Size:     21.38%  3.11    GiB

ARC Hash Breakdown:
        Elements Max:                           1.61m
        Elements Current:               61.38%  986.56k
        Collisions:                             653.96m
        Chain Max:                              27
        Chains:                                 243.95k


------------------------------------------------------------------------

ARC Efficiency:                                 6.56b
        Cache Hit Ratio:                98.75%  6.48b
        Cache Miss Ratio:               1.25%   81.95m
        Actual Hit Ratio:               82.14%  5.39b

        Data Demand Efficiency:         99.56%  3.83b
        Data Prefetch Efficiency:       23.05%  53.24m

        CACHE HITS BY CACHE LIST:
          Anonymously Used:             16.46%  1.07b
          Most Recently Used:           4.48%   289.87m
          Most Frequently Used:         78.70%  5.10b
          Most Recently Used Ghost:     0.07%   4.50m
          Most Frequently Used Ghost:   0.29%   18.94m

        CACHE HITS BY DATA TYPE:
          Demand Data:                  58.89%  3.81b
          Prefetch Data:                0.19%   12.27m
          Demand Metadata:              17.85%  1.16b
          Prefetch Metadata:            23.07%  1.49b

        CACHE MISSES BY DATA TYPE:
          Demand Data:                  20.38%  16.70m
          Prefetch Data:                49.99%  40.97m
          Demand Metadata:              16.74%  13.72m
          Prefetch Metadata:            12.89%  10.56m

------------------------------------------------------------------------

-- 
You are receiving this mail because:
You are the assignee for the bug.