Date: Wed, 7 Mar 2007 14:24:41 -0300 From: "Eduardo Meyer" <dudu.meyer@gmail.com> To: "Bill Moran" <wmoran@collaborativefusion.com> Cc: hackers@freebsd.org, current@freebsd.org Subject: Re: How PMAP_SHPGPERPROC relate to vm.v_free_min, vm.v_free_reserved and vm.v_free_target? Message-ID: <d3ea75b30703070924t3f361c7w42ddb62d698c37fd@mail.gmail.com> In-Reply-To: <20070307114338.344304f9.wmoran@collaborativefusion.com> References: <d3ea75b30703070754p5a8296f3lbaf8dab8b3a24a20@mail.gmail.com> <20070307114338.344304f9.wmoran@collaborativefusion.com>
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> > Heavy Apache usage is demanding a higher PMAP_SHPGPERPROC kernel > > option in my system. However I keep getting the NOTES-documented panic > > at boot time, meaning I need to adequately do vm.v_free_min, > > vm.v_free_reserved and vm.v_free_target sysctl tuning. > > > > However, this sysctl vars dont have a description and I simply can't > > find any further documentation regarding how the vars relate among > > themselves and how they related to PMAP_SHPGPERPROC. Can anyone please > > explain some basics about how they relate and how I can do the tuning? > > > > It is a 5.5-STABLE with 9GB of memory and PAE enable (sure). > > > > Hackers' feedback or sysadmins' personal experiences are heavily appreciated. > > How high did you raise PMAP_SHPGPERPROC? We raised it to 250 on our > stock PostgreSQL systems and did not have to tweak any other values. > > Note that we're running 6.x on these systems, so YMMV. > > > Sorry for cross-posting, I was not sure which list was more adequate. > > Probably -hackers@. Although I would have started with -questions@ > > -- > Bill Moran > Collaborative Fusion Inc. > Mr Moran, did you set up any other sysctl mib such as the mentioned ones? I have raised it to "500". If I set lower values, around 400 I start getting a huge flood of: collecting pv entries -- suggest increasing PMAP_SHPGPERPROC collecting pv entries -- suggest increasing PMAP_SHPGPERPROC Specially on "apachectl graceful" signaling. If I raise it over 500 my system panics on boot. I still get "collecting pv entries -- suggest increasing PMAP_SHPGPERPROC" at the current setup value, however not very often. -- =========== Eduardo Meyer pessoal: dudu.meyer@gmail.com profissional: ddm.farmaciap@saude.gov.br
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