kern/187594: [zfs] [patch] ZFS ARC behavior problem and fix
Karl Denninger
karl at denninger.net
Thu Apr 3 17:00:01 UTC 2014
The following reply was made to PR kern/187594; it has been noted by GNATS.
From: Karl Denninger <karl at denninger.net>
To: bug-followup at FreeBSD.org
Cc:
Subject: Re: kern/187594: [zfs] [patch] ZFS ARC behavior problem and fix
Date: Thu, 03 Apr 2014 11:57:50 -0500
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After more than a week of operation without any changes on a very busy=20
production server this is what the status looks like at this particular=20
moment in time (caught it being pretty quiet at the moment... slow day):
[karl at NewFS ~]$ uptime
11:56AM up 10 days, 20:37, 1 user, load averages: 0.80, 0.59, 0.58
[karl at NewFS ~]$ uname -v
FreeBSD 10.0-STABLE #22 r263665:263671M: Sun Mar 23 15:00:48 CDT 2014
karl at NewFS.denninger.net:/usr/obj/usr/src/sys/KSD-SMP
1 users Load 0.50 0.57 0.58 Apr 3 11:52
Mem:KB REAL VIRTUAL VN PAGER SWAP P=
AGER
Tot Share Tot Share Free in out in =
out
Act 4503936 32680 9319616 54908 701712 count
All 17598k 42312 10162228 293268 pages
Proc: Interrup=
ts
r p d s w Csw Trp Sys Int Sof Flt ioflt 2635 to=
tal
2 245 3 9936 4302 12k 990 442 2878 1161 cow 11 ua=
rt0 4
1460 zfod 53 uh=
ci0 16
0.6%Sys 0.1%Intr 1.5%User 0.0%Nice 97.8%Idle ozfod pc=
m0 17
| | | | | | | | | | %ozfod ehc=
i0 uhci
> daefr uhc=
i1 21
dtbuf 1779 prcfr 532 uh=
ci3 ehci
Namei Name-cache Dir-cache 485888 desvn 3862 totfr 44 twa=
0 30
Calls hits % hits % 145761 numvn react 989 cp=
u0:timer
18611 18549 100 121467 frevn pdwak 69 mp=
s0 256
909 pdpgs 24 em=
0:rx 0
Disks da0 da1 da2 da3 da4 da5 da6 intrn 32 em0=
:tx 0
KB/t 10.30 10.39 0.00 0.00 22.61 24.69 24.39 19017980 wire em0=
:link
tps 21 21 0 0 10 16 16 2197580 act 118 em1=
:rx 0
MB/s 0.22 0.22 0.00 0.00 0.22 0.39 0.39 2544544 inact 107 em1=
:tx 0
%busy 19 19 0 0 0 1 1 3276 cache em1=
:link
698064 free ah=
ci0:ch0
buf 32 cp=
u1:timer
24 cp=
u10:time
50 cp=
u6:timer
26 cp=
u12:time
37 cp=
u7:timer
45 cp=
u14:time
41 cp=
u4:timer
35 cp=
u15:time
25 cp=
u5:timer
45 cp=
u9:timer
45 cp=
u2:timer
102 cp=
u11:time
63 cp=
u3:timer
41 cp=
u13:time
45 cp=
u8:timer
[karl at NewFS ~]$ zpool list
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
media 2.72T 2.12T 616G 77% 1.00x ONLINE -
zroot 234G 18.8G 215G 8% 1.36x ONLINE -
zstore 3.63T 2.50T 1.13T 68% 1.00x ONLINE -
[karl at NewFS ~]$ zfs-stats -A
------------------------------------------------------------------------
ZFS Subsystem Report Thu Apr 3 11:53:42 2014
------------------------------------------------------------------------
ARC Summary: (HEALTHY)
Memory Throttle Count: 0
ARC Misc:
Deleted: 27.84m
Recycle Misses: 1.12m
Mutex Misses: 2.65k
Evict Skips: 39.26m
ARC Size: 59.13% 13.20 GiB
Target Size: (Adaptive) 59.14% 13.20 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: 81.41% 10.75 GiB
Frequently Used Cache Size: 18.59% 2.46 GiB
ARC Hash Breakdown:
Elements Max: 2.69m
Elements Current: 63.22% 1.70m
Collisions: 95.13m
Chain Max: 24
Chains: 413.62k
------------------------------------------------------------------------
[karl at NewFS ~]$ zfs-stats -E
------------------------------------------------------------------------
ZFS Subsystem Report Thu Apr 3 11:53:59 2014
------------------------------------------------------------------------
ARC Efficiency: 1.28b
Cache Hit Ratio: 98.37% 1.26b
Cache Miss Ratio: 1.63% 20.80m
Actual Hit Ratio: 60.07% 766.91m
Data Demand Efficiency: 99.15% 435.02m
Data Prefetch Efficiency: 20.45% 17.49m
CACHE HITS BY CACHE LIST:
Anonymously Used: 38.72% 486.24m
Most Recently Used: 3.74% 46.94m
Most Frequently Used: 57.33% 719.97m
Most Recently Used Ghost: 0.06% 792.68k
Most Frequently Used Ghost: 0.16% 1.97m
CACHE HITS BY DATA TYPE:
Demand Data: 34.34% 431.32m
Prefetch Data: 0.28% 3.58m
Demand Metadata: 23.72% 297.92m
Prefetch Metadata: 41.65% 523.09m
CACHE MISSES BY DATA TYPE:
Demand Data: 17.75% 3.69m
Prefetch Data: 66.88% 13.91m
Demand Metadata: 5.78% 1.20m
Prefetch Metadata: 9.60% 2.00m
------------------------------------------------------------------------
Grinnin' big, in short.
I have no reason to make further changes to the code or defaults.
--=20
-- Karl
karl at denninger.net
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