The KVM for 32 bit kernels is getting a bit squeezed. The recent pmap
work ate another 64M from the 1G kernel map and that combined with
a graphics card with a 256M frame buffer is enough to run the kernel_map
out of space after a while.
This mainly occurs if you have 3G or more of ram in the machine as
the kernel reserves more KVM for the buffer cache and vnodes when
you have more ram in the machine.
The easiest solution if this is happening to you is to reduce the
graphics memory to 128M or 64M. Alternatively you can reduce the
size of the buffer cache slightly. e.g. if sysctl vfs.nbuf is
12800 you can reduce it in /boot/loader.conf with something like
kern.nbuf=9600 (note the sysctl is vfs.nbuf but the loader.conf
variable is kern.nbuf).
I am considering my options on how to fix this permanently.
-Matt
Matthew Dillon
<dil...@backplane.com>
