Date: Tue, 25 Aug 2009 11:37:00 +0200 From: Julien Cigar <jcigar@ulb.ac.be> To: freebsd-questions@freebsd.org Subject: Approaching the limit on PV entries, consider increasing either the vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable Message-ID: <1251193020.2996.15.camel@frodon.be-bif.ulb.ac.be>
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Hello, We have an HP Proliant DL380G5 with 4GB of RAM and FreeBSD 7.0 which runs PostgreSQL 8.3 for more than a year now. No problems, except that two days ago I noticed those messages in my kernel logs : "Approaching the limit on PV entries, consider increasing either the vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable." Since vm.pmap.shpgperproc and vm.pmap.pv_entry_max require a reboot I want to be sure that I put "good" values (for ex: I read that increasing too much vm.pmap.shpgperproc could result in a panic at boot time or later). I have the following in /boot/loader.conf : kern.ipc.semmni=1024 kern.ipc.semmns=16384 kern.ipc.semmnu=16384 vm.pmap.shpgperproc=225 vm.pmap.pv_entry_max=4134816 and the following in /etc/sysctl.conf : kern.ipc.shmall=262144 kern.ipc.shmmax=1073741824 kern.ipc.semmap=16384 kern.ipc.shm_use_phys=1 Do you think that those values for vm.pmap.pv_entry_max and vm.pmap.shpgperproc are OK ? Is it OK to increase vm.pmap.pv_entry_max as long as vm.kvm_free is not too low ? Thanks, Julien -- Julien Cigar Belgian Biodiversity Platform http://www.biodiversity.be Université Libre de Bruxelles (ULB) Campus de la Plaine CP 257 Bâtiment NO, Bureau 4 N4 115C (Niveau 4) Boulevard du Triomphe, entrée ULB 2 B-1050 Bruxelles Mail: jcigar@ulb.ac.be @biobel: http://biobel.biodiversity.be/person/show/471 Tel : 02 650 57 52 No trees were killed in the creation of this message. However, many electrons were terribly inconvenienced.
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