From owner-freebsd-hackers@FreeBSD.ORG Thu Nov 8 22:29:35 2007 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 12D8216A46C for ; Thu, 8 Nov 2007 22:29:35 +0000 (UTC) (envelope-from dclements@gmail.com) Received: from rv-out-0910.google.com (rv-out-0910.google.com [209.85.198.189]) by mx1.freebsd.org (Postfix) with ESMTP id CF81A13C4B0 for ; Thu, 8 Nov 2007 22:29:34 +0000 (UTC) (envelope-from dclements@gmail.com) Received: by rv-out-0910.google.com with SMTP id l15so271889rvb for ; Thu, 08 Nov 2007 14:29:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=Ckbtib8dZFU5qec3DIhsLtRUIE/wLeRSKfIwswFjBdQ=; b=lsOxEwiYWAFkTuuPy1tkUK+3bhOQ3qLFvxyyM2QK6GSL7KdmeMHG40CsA0bksS1yjUDBZKe+ibZk2Rt4LBWDzxT7UQE7J8aoJX/euSTpHuCE4dxuZ8ujuPOGpON6JkwtnNTquSOjBzd21Tpy3idsCeiMPWZa9jFzMcs4xyfaEGE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=NOUXzXdI6MIOvM0HRBOEADvgFq4ivcnFJ2n164hwpqznhyqavviV4IDvk84znN4STxPXAN6YfjTviIZvbnvQSOscf84voIEptdgVfL3ty7j5gky+hBUMbDyUMMIZIwRSX2ev45moN/g+k5IdLovFUKzx6wDB6LRJbmnB8yhjWFI= Received: by 10.141.123.4 with SMTP id a4mr605217rvn.1194560968380; Thu, 08 Nov 2007 14:29:28 -0800 (PST) Received: by 10.140.186.21 with HTTP; Thu, 8 Nov 2007 14:29:28 -0800 (PST) Message-ID: <54da514e0711081429g5535598exef08cb46765fa591@mail.gmail.com> Date: Thu, 8 Nov 2007 14:29:28 -0800 From: "Doug Clements" To: binto In-Reply-To: <28483.202.123.224.34.1194493720.squirrel@webmail.triplegate.net.id> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <4635.202.127.98.144.1194407276.squirrel@webmail.triplegate.net.id> <54da514e0711071023g565cf98ay54ff2bb9cfeeb38a@mail.gmail.com> <28483.202.123.224.34.1194493720.squirrel@webmail.triplegate.net.id> Cc: freebsd-hackers@freebsd.org Subject: Re: page fault & degaradation performance X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2007 22:29:35 -0000 Running out of memory and having to continually swap things in and out of ram degrades performance, yes. Page faults are simply how the virtual memory subsystem gets things done, like pulling things out of swap. --Doug On Nov 7, 2007 7:48 PM, binto wrote: > Btw > > Even page fault isn't a terrible thing, but she could make > trashing condition..that can degrade CPU utilization, am i correct? > > > > > > > > On 11/6/07, binto wrote: > >> > >> I just wanna know, > >> how to reduce the number of page faults to upgrade program or OS > >> performance? > >> is there any parameters that i must set if i reduce the number of page > >> fault? > > > > > > Don't forget that some amount of page faults are normal consequences of > > using a machine with virtual memory. Page faults alone are not an > > indicator > > that you're out of memory or suffering in any way, they just mean that > > something was requested in vm that wasn't actually in ram, and needed to > > be > > loaded. Ask 'swapinfo' or 'top' to see if you might possibly benefit from > > more ram by reducing paging. > > > > --Doug > > > _______________________________________________ > > freebsd-hackers@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > > > > >