Alexey Popov wrote:
After some time of running under high load disk performance become
expremely poor. At that periods 'systat -vm 1' shows something like this:
What does "high load" mean? You need to explain the system workload more.
Disks amrd0
KB/t 85.39
tps 5
MB/s 0.38
% busy 99
Apart of all, I tried to make mutex profiling and here's the results
(sorted by the total number of acquisitions):
Bad case:
102 223514 273977 0 14689 1651568 /usr/src/sys/vm/uma_core.c:2349 (512)
950 263099 273968 0 15004 14427 /usr/src/sys/vm/uma_core.c:2450 (512)
108 150422 175840 0 10978 22988519 /usr/src/sys/vm/uma_core.c:1888 (mbuf)
> Here you can see that high UMA activity happens in periods of low disk
> performance. But I'm not sure whether this is a root of the problem, not
> a consequence.
The extremely high contention there does seem to say you have a mbuf
starvation problem and not a disk problem. I don't know why this would
be happening off-hand.
Can you also provide more details about the system hardware and
configuration?
Kris
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