Re: Random lockups on an email server - possibly kern/50168

["D'Arcy J.M. Cain" <darcy%NetBSD.org@localhost>]

On Sun, 27 Mar 2016 17:12:38 -0400
Dan LaBell <dan4l-nospam%verizon.net@localhost> wrote:
> > The other thing I see is that swap never gets used.  The system  
> > appears
> > to crash when real memory gets used up and swap used is always 0.
> What happens if you force swap to be used, like mounting a mfs file  
> system
> larger than free memory, and filling it?

I was afraid to try on the production server but I did play with a
spare.  In fact, the spare was the previous email server.  I thought
that it might be hardware problems so I swapped out the machine.

I ran a program that used up more memory than physical memory.  It went
to swap just fine.

So swap works but available real memory in dropping with no indication
of what is using it.  My test program now shows this:

PS:        2209720
PROC:     18198136

As far as I can tell I am seeing a total of 2GB of memory used by all
processes and resident in memory but the system (top and /proc/meminfo)
are telling me that 17GB of memory is in use.  What's using the other
15GB?

-- 
D'Arcy J.M. Cain <darcy%NetBSD.org@localhost>
http://www.NetBSD.org/ IM:darcy%Vex.Net@localhost