7.0 unusual performance issue - vmdaemon hang?

[Steven Hartland]

Just had one of hour webservers flag as down here and on
investigation the machine seems to be struggling due to
a hung vmdaemon process.

top is reporting vmdaemon as using a constant 55.57% CPU
yet CPU time is not increasing:-

last pid: 36492;  load averages:  0.04,  0.05,  .11       up 89+19:53:21  14:36:08
223 processes: 9 running, 201 sleeping, 13 waiting
CPU states:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle
Mem: 644M Active, 2780M Inact, 480M Wired, 249M Cache, 214M Buf, 3759M Free
Swap: 4096M Total, 537M Used, 3559M Free, 13% Inuse

  PID USERNAME     THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU COMMAND
   11 root           1 171 ki31     0K    16K CPU7   7 2116.4 100.00% idle: cpu7
   12 root           1 171 ki31     0K    16K CPU6   6 2059.5 100.00% idle: cpu6
   13 root           1 171 ki31     0K    16K CPU5   5 2029.3 100.00% idle: cpu5
   14 root           1 171 ki31     0K    16K CPU4   4 1977.8 100.00% idle: cpu4
   15 root           1 171 ki31     0K    16K CPU3   3 1912.0 100.00% idle: cpu3
   16 root           1 171 ki31     0K    16K CPU2   2 1835.2 100.00% idle: cpu2
   17 root           1 171 ki31     0K    16K CPU1   1 1763.1 100.00% idle: cpu1
   18 root           1 171 ki31     0K    16K RUN    0 1727.6 100.00% idle: cpu0
   37 root           1  20    -     0K    16K psleep 5   0:56 55.57% vmdaemon
60198 www            1   4    0    98M 13516K sbwait 2  35:21  1.46% httpd
60264 www            1   4    0   133M  9248K sbwait 0  21:21  0.39% httpd
   30 root           1 -68    -     0K    16K -      7  18.3H  0.00% em1 taskq
   29 root           1 -68    -     0K    16K -      6 330:21  0.00% em0 taskq
   41 root           1  20    -     0K    16K syncer 1 212:42  0.00% syncer
   21 root           1 -44    -     0K    16K WAIT   0 201:02  0.00% swi1: net
   19 root           1 -32    -     0K    16K WAIT   0 120:15  0.00% swi4: clock
   22 root           1  44    -     0K    16K -      5  73:00  0.00% yarrow

I've tried to ktrace the process and it produced nothing, also tried
gdb and it failed to attach. Is there anything else I can try before
we reboot the machine to help determine what the problem is?

    Regards
    Steve

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