From owner-freebsd-fs@FreeBSD.ORG Wed Apr 7 18:46:40 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 27B5C1065673 for ; Wed, 7 Apr 2010 18:46:40 +0000 (UTC) (envelope-from rincebrain@gmail.com) Received: from mail-pw0-f54.google.com (mail-pw0-f54.google.com [209.85.160.54]) by mx1.freebsd.org (Postfix) with ESMTP id EFF9E8FC1A for ; Wed, 7 Apr 2010 18:46:39 +0000 (UTC) Received: by pwi9 with SMTP id 9so1386539pwi.13 for ; Wed, 07 Apr 2010 11:46:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:received:message-id:subject :from:to:cc:content-type; bh=bekRJ466Znl8Xsia05ITNxLjGtCViww2/UZ/GUnywVw=; b=GOAyTZptnUn1JFSVVBjGX9FXitp065NnDeQzz8PPqdOvTCzNtAbjkdbnV0yezdIe5P bZTE/w+nTGK+jCcZeTJnRmwxmsuq8Tlasr9Gm3eoRyQsu+M8Ub4Snjv96ud0uP9gNDa2 2g1sD+2NOlZs95bJwok7k9Li5SjyAVyePEI7Y= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=jz5r1N3MpylJ+KuDMdz+0KSigsBJTkB3BDj19mq/bEtdNZ+TyeL/qn0TOjg4WFgtli gHyCghBUDy0ZtumyhNWqTixHom2qvid2KOflgOL5Gat5hZuUaw9vQ1JDIdVq5WDXJ7T3 VLJ+TxqdF1XDX/Qf9tjwxox3S8kATzvJezlPk= MIME-Version: 1.0 Sender: rincebrain@gmail.com Received: by 10.231.60.197 with HTTP; Wed, 7 Apr 2010 11:46:39 -0700 (PDT) In-Reply-To: References: Date: Wed, 7 Apr 2010 14:46:39 -0400 X-Google-Sender-Auth: ef541872665b5988 Received: by 10.114.187.29 with SMTP id k29mr281508waf.208.1270665999504; Wed, 07 Apr 2010 11:46:39 -0700 (PDT) Message-ID: From: Rich To: Peter Schuller Content-Type: text/plain; charset=ISO-8859-1 Cc: freebsd-fs@freebsd.org Subject: Re: ZFS arc sizing (maybe related to kern/145229) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 07 Apr 2010 18:46:40 -0000 A datapoint for you: Now running 8-STABLE (plus the mbuf leak fix which went in recently), here's my ARC stats and ARC sysctl settings after the server was up for about a week (5 days) after that: ARC Size: Current Size: 587.49M (arcsize) Target Size: (Adaptive) 587.63M (c) Min Size (Hard Limit): 512.00M (arc_min) Max Size (Hard Limit): 3072.00M (arc_max) ARC Size Breakdown: Recently Used Cache Size: 98.28% 577.50M (p) Frequently Used Cache Size: 1.72% 10.12M (c-p) ARC Efficiency: Cache Access Total: 2602789964 Cache Hit Ratio: 96.11% 2501461882 Cache Miss Ratio: 3.89% 101328082 Actual Hit Ratio: 87.65% 2281380527 and vfs.zfs.arc_meta_limit=1073741824 vfs.zfs.arc_meta_used=548265792 vfs.zfs.arc_min=536870912 vfs.zfs.arc_max=3221225472 So it very clearly limits to near the minimum size, but whether this is design or accidental behavior, I'm unsure.