Date: Thu, 15 May 2008 10:17:44 +0300 From: Evren Yurtesen <yurtesen@ispro.net> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: freebsd-stable@freebsd.org Subject: Re: Approaching the limit on PV entries, consider increasing either the vm.pmap.shpgperproc or the vm.pmap.pv_entry_max sysctl. Message-ID: <482BE398.8010203@ispro.net> In-Reply-To: <20080515010347.GA85202@eos.sc1.parodius.com> References: <482B4DEE.3050705@ispro.net> <20080515010347.GA85202@eos.sc1.parodius.com>
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Jeremy Chadwick wrote: > On Wed, May 14, 2008 at 11:39:10PM +0300, Evren Yurtesen wrote: >> Approaching the limit on PV entries, consider increasing either the >> vm.pmap.shpgperproc or the vm.pmap.pv_entry_max sysctl. >> Approaching the limit on PV entries, consider increasing either the >> vm.pmap.shpgperproc or the vm.pmap.pv_entry_max sysctl. > > I've seen this message on one of our i386 RELENG_7 boxes, which has a > medium load (webserver with PHP) and 2GB RAM. Our counters, for > comparison: > > vm.pmap.pmap_collect_active: 0 > vm.pmap.pmap_collect_inactive: 0 > vm.pmap.pv_entry_spare: 7991 > vm.pmap.pv_entry_allocs: 807863761 > vm.pmap.pv_entry_frees: 807708792 > vm.pmap.pc_chunk_tryfail: 0 > vm.pmap.pc_chunk_frees: 2580082 > vm.pmap.pc_chunk_allocs: 2580567 > vm.pmap.pc_chunk_count: 485 > vm.pmap.pv_entry_count: 154969 > vm.pmap.shpgperproc: 200 > vm.pmap.pv_entry_max: 1745520 > I guess one good question is, how can one see the number of PV entries used by a process? shouldnt these appear in the output of ipcs -a command? Another good question is, in many places there is references to rebooting after putting a new vm.pmap.shpgperproc value to loader.conf. However I just changed this on a running system, has it really been changed or was I suppose to reboot? In either case, I already increased vm.pmap.shpgperproc to 2000 (from 200) and still the error occurs, there is not so much load on this box, maybe there is a leak somewhere? Thanks, Evren
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