pgdaemon high CPU consumption

[Matthias Petermann <mp%petermann-it.de@localhost>]

Good day,

since some time I noticed that on several of my systems with 
NetBSD/amd64 9.99.97/98 after longer usage the kernel process pgdaemon 
completely claims a CPU core for itself, i.e. constantly consumes 100%.
The affected systems do not have a shortage of RAM and the problem does 
not disappear even if all workloads are stopped, and thus no RAM is 
actually used by application processes.

I noticed this especially in connection with accesses to the ZFS set up 
on the respective machines - for example after checkout from the local 
CVS relic hosted on ZFS.

Is there already a known problem or what information would have to be 
collected to get to the bottom of this?

I currently have such a case online, so I would be happy to pull 
diagnostic information this evening/afternoon. At the moment all info I 
have is from top.

Normal view:

```
  PID USERNAME PRI NICE   SIZE   RES STATE       TIME   WCPU    CPU COMMAND
    0 root     126    0     0K   34M CPU/0     102:45   100%   100% 
[system]
```

Thread view:


```
  PID   LID USERNAME PRI STATE       TIME   WCPU    CPU NAME      COMMAND
    0   173 root     126 CPU/1      96:57 98.93% 98.93% pgdaemon  [system]
```

Kind regards
Matthias

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