Hi,
we've capped Arcsize via set zfs:zfs_arc_max = 0x20000000 in /etc/system to 512
MB, since ARC
still does not release memory when applications need it (this is another bug).
But this hard limit is
not obeyed, instead, when traversing all files in a large and deep directory,
we see the values below
(arc started with 300 MB). After a while, machine (Ultra 20 M2 with 6GB) swaps
and then, hours later, freezes completely (even no reaction on quick push power
button, no ping, no mouse, have to hard
reset). Arc summary shows clearly that limits are not what they supposed to be.
If this is working as
intended, then the intention must be changed. As poorly as ARC is working now,
it's absolutely
necessary that a hard limit is indeed a hard limit for ARC. Please fix this. Is
there anything I can do to
really limit or switch off the ARC completely ? It's breaking our production
work often since we've
installed OSol (we came from SXDE 1.08 which worked better), we must find a way
to stop this
problem as fast as possible !
arcstat:
Time read miss miss% dmis dm% pmis pm% mmis mm% arcsz c
13:22:16 95M 23M 24 10M 14 12M 64 22M 24 963M 536M
13:22:17 2K 256 10 79 6 177 15 222 9 965M 536M
13:22:18 2K 490 22 119 10 371 38 482 22 970M 536M
13:22:19 4K 214 4 150 6 64 3 140 3 971M 536M
13:22:20 2K 427 19 57 4 370 37 419 19 971M 536M
13:22:21 1K 208 19 103 17 105 21 202 19 971M 536M
....
13:23:16 1K 481 27 80 8 401 47 478 27 1G 536M
13:23:17 2K 255 11 125 10 130 13 218 10 1G 536M
and counting...
arc_summary:
System Memory:
Physical RAM: 6134 MB
Free Memory : 1739 MB
LotsFree: 95 MB
ZFS Tunables (/etc/system):
set zfs:zfs_arc_max = 0x20000000
ARC Size:
Current Size: 1357 MB (arcsize)
Target Size (Adaptive): 512 MB (c)
Min Size (Hard Limit): 191 MB (zfs_arc_min)
Max Size (Hard Limit): 512 MB (zfs_arc_max)
ARC Size Breakdown:
Most Recently Used Cache Size: 93% 479 MB (p)
Most Frequently Used Cache Size: 6% 32 MB (c-p)
ARC Efficency:
Cache Access Total: 97131108
Cache Hit Ratio: 75% 73244441 [Defined State for
buffer]
Cache Miss Ratio: 24% 23886667 [Undefined State for
Buffer]
REAL Hit Ratio: 67% 65874421 [MRU/MFU Hits Only]
Data Demand Efficiency: 66%
Data Prefetch Efficiency: 8%
CACHE HITS BY CACHE LIST:
Anon: --% Counter Rolled.
Most Recently Used: 15% 11463028 (mru) [
Return Customer ]
Most Frequently Used: 74% 54411393 (mfu) [
Frequent Customer ]
Most Recently Used Ghost: 10% 7537123 (mru_ghost) [
Return Customer Evicted, Now Back ]
Most Frequently Used Ghost: 19% 14619417 (mfu_ghost) [
Frequent Customer Evicted, Now Back ]
CACHE HITS BY DATA TYPE:
Demand Data: 3% 2716192
Prefetch Data: 0% 3506
Demand Metadata: 86% 63089419
Prefetch Metadata: 10% 7435324
CACHE MISSES BY DATA TYPE:
Demand Data: 5% 1365132
Prefetch Data: 0% 36544
Demand Metadata: 40% 9664064
Prefetch Metadata: 53% 12820927
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