From owner-freebsd-questions@FreeBSD.ORG Tue Jul 27 14:33:44 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DB6C3106566B for ; Tue, 27 Jul 2010 14:33:44 +0000 (UTC) (envelope-from freebsd-questions-local@be-well.ilk.org) Received: from mail8.sea5.speakeasy.net (mail8.sea5.speakeasy.net [69.17.117.53]) by mx1.freebsd.org (Postfix) with ESMTP id B6A118FC18 for ; Tue, 27 Jul 2010 14:33:44 +0000 (UTC) Received: (qmail 13507 invoked from network); 27 Jul 2010 14:33:44 -0000 Received: from dsl092-078-145.bos1.dsl.speakeasy.net (HELO be-well.ilk.org) ([66.92.78.145]) (envelope-sender ) by mail8.sea5.speakeasy.net (qmail-ldap-1.03) with SMTP for ; 27 Jul 2010 14:33:43 -0000 Received: by be-well.ilk.org (Postfix, from userid 1147) id 0F6CF5084F; Tue, 27 Jul 2010 10:33:43 -0400 (EDT) From: Lowell Gilbert To: Jason References: <4C4BB441.2040103@gmail.com> Date: Tue, 27 Jul 2010 10:33:42 -0400 In-Reply-To: <4C4BB441.2040103@gmail.com> (Jason's message of "Sun, 25 Jul 2010 11:49:21 +0800") Message-ID: <44zkxd6lkp.fsf@be-well.ilk.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: bsd Subject: Re: What's the meaning of this warn? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: bsd List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Jul 2010 14:33:44 -0000 Jason writes: > HI,ALL: > > My freebsd server offer service to thousands of clients. > I found lots of warning in the /var/log/message like this :"Approaching > the limit on PV entries, consider increasing either the > vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable" > > My question is : > 1.what is the meaning of PV? Physical-to-Virtual mappings. > 2.Although there are lots of this warning,my server works still well. > Could someone explain the meaning of this warning ? With thousands of people running the same programs, there will be a lot of mappings for the memory pages containing the programs themselves, the libraries they use, and so on. As long as you're not running out of memory in general, you might get better performance by having more pv_entry structures available in the system.