Date: Fri, 7 Dec 2007 17:42:18 +0100 From: "Claus Guttesen" <kometen@gmail.com> To: "Uwe Doering" <gemini@geminix.org> Cc: Stephen.Clark@seclark.us, freebsd-stable@freebsd.org Subject: Re: 4.x Collecting pv entries Suggest increasing PMAP_SHPGPERPROC, Message-ID: <b41c75520712070842k9f170f7u1cd827c34d3a7d5d@mail.gmail.com> In-Reply-To: <4759717D.2090409@geminix.org> References: <47594087.7030703@seclark.us> <b41c75520712070453w11181b7am9d95a215d15ad091@mail.gmail.com> <475952EF.70400@seclark.us> <47596B11.90601@geminix.org> <47596CD2.4080502@seclark.us> <4759717D.2090409@geminix.org>
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> >> But you can put that option into the kernel config file: > >> > >> options PMAP_SHPGPERPROC=... > >> > >> and build a new kernel with it. > > > > You are correct. My question is more how much should I increase it. The > > current default in the 4.x LINT file > > is "options PMAP_SHPGPERPROC=201" should I double it? Increase it by 50 > > to 251? Should it be a prime number? > > I am just asking for information. > > The settings in the LINT file are not necessarily the defaults, rather > mere examples. The default value for PMAP_SHPGPERPROC is 200 (defined > in the source file /usr/src/sys/i386/i386/pmap.c). I would recommend to > increase it by 100 until the messages stop. We use 300 on our servers, > for instance. I do recall I had the same message on a 5.x-server (running postgresql-server I think, some years ago now :-) ) once in a while. I think I raised it twice to 400. I remember that the recommendation was not to raise it too high in order not to make the kernel panic during boot. -- regards Claus When lenity and cruelty play for a kingdom, the gentlest gamester is the soonest winner. Shakespeare
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