I just noticed today I'm starting to get messages in ../messages stating:

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

I did some searching and don't really know what is going on. I did a search using sysctl for all pmap knobs and this is what they are currently:

  vm.pmap.pmap_collect_active: 0
  vm.pmap.pmap_collect_inactive: 0
  vm.pmap.pv_entry_spare: 51310
  vm.pmap.pv_entry_allocs: 67575721858
  vm.pmap.pv_entry_frees: 67574088800
  vm.pmap.pc_chunk_tryfail: 0
  vm.pmap.pc_chunk_frees: 416252902
  vm.pmap.pc_chunk_allocs: 416262928
  vm.pmap.pc_chunk_count: 10026
  vm.pmap.pv_entry_count: 1633059
  vm.pmap.shpgperproc: 500
  vm.pmap.pv_entry_max: 6125408

I did increased vm.pmap.shpgperproc to 500 from 200 and immediately saw vm.pmap.pv_entry_max increase as well.

This server is a Dell PowerEdge 6850 with four 3.0Gz dual core Zeon processors and 12Gb ram. The server's only purpose is a spam filter. It is running SpamAssassin, ClamAV, Postfix and MySQL. The server is pretty memory intensive. Active memory usually doesn't drop below 8Gb. SpamAssassin usually has roughly 24 children running all the time consuming ~120Mb per child. MySQL is currently taking ~5.5Gb.

Can someone shed light on what is going on or what needs to be tweaked?

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