On a server that's been experiencing some issues, I note the following
in "vmstat -z":
ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP
UMA Kegs: 208, 0, 188, 16, 188, 0, 0
UMA Zones: 3456, 0, 188, 0, 188, 0, 0
UMA Slabs: 568, 0, 1209668, 6211,50929964, 0, 0
UMA RCntSlabs: 568, 0, 50791, 1, 50791, 0, 0
UMA Hash: 256, 0, 78, 12, 80, 0, 0
16 Bucket: 152, 0, 227, 23, 227, 0, 0
32 Bucket: 280, 0, 522, 10, 522, 0, 0
64 Bucket: 536, 0, 783, 1, 783, 156, 0
128 Bucket: 1048, 0, 33513, 0, 33513,134423, 0
[...]
How should I interpret the failure count for "64 Bucket" and "128
Bucket"? Does it represent a problem, or something that needs to be
tuned? There are no obvious tunables, but the code is not exactly
transparent. No other zones show failures.
-GAWollman
