swap zone exhausted, increase kern.maxswzone

[Kris Kennaway]

On Sat, May 05, 2007 at 01:11:35PM -0700, Matthew Dillon wrote:
> :That's why I think that the socket issue and this one are co-related ... with 
> :everything started up (93 jails), my swap usage right now is:
> :
> :mars# pstat -s
> :Device          1K-blocks     Used    Avail Capacity
> :/dev/da0s1b       8388608       20  8388588     0%
> :
> :Its only been up 2.5 hours so far, but still, everything is started up ...
> :
> :- ----
> :Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
> 
>     The "swap zone exhausted, increase kern.maxswzone" message only prints
>     if uma_zone_exhausted() returns TRUE.  uma_zone_exhausted() appears to
>     be based on a UMA flag which is only set if the pages for the zone
>     exceeds some maximum setting.
> 
>     Insofar as I can tell, vmstat -z on FreeBSD will dump the UMA zones,
>     so try using that when the problem occurs along with pstat -s.  It
>     sounds like there is a leak somewhere (but I don't see how anything
>     in any other UMA zones could cause the SWAPMETA zone to fill up).  Or
>     the maximum setting is too low, or something is getting lost somewhere.

I doubt there is a leak, that's just guesswork on your part :).  I
only see this problem on my machines when they really do use too much
swap.  Let's wait to see what happens on Marc's machine.

Kris