From owner-freebsd-stable@FreeBSD.ORG Thu Jun 18 00:07:56 2009 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F3EC5106568E; Thu, 18 Jun 2009 00:07:55 +0000 (UTC) (envelope-from dan.naumov@gmail.com) Received: from mail-yx0-f200.google.com (mail-yx0-f200.google.com [209.85.210.200]) by mx1.freebsd.org (Postfix) with ESMTP id 8EFDB8FC24; Thu, 18 Jun 2009 00:07:55 +0000 (UTC) (envelope-from dan.naumov@gmail.com) Received: by yxe38 with SMTP id 38so985121yxe.3 for ; Wed, 17 Jun 2009 17:07:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=mrblN0JeWeMmZd2HDlpsgZ8/1eIOz5OAOKQM6WNtmdM=; b=nQD66o8PAsPZaxybWYIKocSJwtWfw35yOeNHS1XhC/V1/srzYLpZN+DMRFnDenXvtz Nc5mMdp5TaPyx03N3BjqjAqkJzaF2qZHYw577goUVdjHVUAVH5tCdORUYJlXpqXNGyek QsI0WbydaWEqZ0QtoC59l7OXPHXgcan/8Ac8Y= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=oxy6JrEz8HJMVF7Gr8hCzR4L+TqiWkSy9xlNnlQxAnDzuxta7MuHmEtF8NbT3O23vm u+ytEAjUdiA3S3ETQe8yS+Zkd7DuNZ8cR8zLK+AUU7sg/xpAD63z4J1s6CozMt39y+TV pw5NGjtvCy4guDv/nBjao3hlmXMHXLZKhwb1o= MIME-Version: 1.0 Received: by 10.100.41.9 with SMTP id o9mr1107355ano.155.1245283671367; Wed, 17 Jun 2009 17:07:51 -0700 (PDT) In-Reply-To: References: Date: Thu, 18 Jun 2009 03:07:51 +0300 Message-ID: From: Dan Naumov To: Ronald Klop Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-fs@freebsd.org, FreeBSD-STABLE Mailing List Subject: Re: ZFS performance on 7.2-release/amd64 low compared to UFS2 + SoftUpdates X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Jun 2009 00:07:56 -0000 All the ZFS tuning guides for FreeBSD (including one on the FreeBSD ZFS wiki) have recommended values between 64M and 128M to improve stability, so that what I went with. How much of my max kmem is it safe to give to ZFS? - Dan Naumov On Thu, Jun 18, 2009 at 2:51 AM, Ronald Klop wrote: > Isn't 96M for ARC really small? > Mine is 860M. > vfs.zfs.arc_max: 860072960 > kstat.zfs.misc.arcstats.size: 657383376 > > I think the UFS2 cache is much bigger which makes a difference in your test. > > Ronald. >