Approaching the limit on PV entries

[Ivan Voras]

During heavy postgresql load (pgbench), /var/log/messages registers
(multiple times) the following message:

"Approaching the limit on PV entries, consider increasing either the
vm.pmap.shpgperproc or the vm.pmap.pv_entry_max sysctl"

I'm increasing both, but no matter what I increase them to, after a
short time they again get increased by the system (???).

The values are currently:

vm.pmap.shpgperproc: 1134
vm.pmap.pv_entry_max: 8000000

But the last sysctl setting, verified by retrieving it from my shell
command line history, is that I set vm.pmap.shpgperproc to 800.

Is this normal, and what are the common settings for these values? The
machine is 2x4-core, currently 4 GB RAM (which will increase to at least
6 GB), amd64, running postgresql, php and apache.

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