From owner-freebsd-stable@freebsd.org Tue Nov 24 15:42:40 2015 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 1459DA365B7 for ; Tue, 24 Nov 2015 15:42:40 +0000 (UTC) (envelope-from mike@sentex.net) Received: from smarthost1.sentex.ca (smarthost1.sentex.ca [IPv6:2607:f3e0:0:1::12]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "smarthost.sentex.ca", Issuer "smarthost.sentex.ca" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id D4B59104C for ; Tue, 24 Nov 2015 15:42:39 +0000 (UTC) (envelope-from mike@sentex.net) Received: from [IPv6:2607:f3e0:0:4:f025:8813:7603:7e4a] (saphire3.sentex.ca [IPv6:2607:f3e0:0:4:f025:8813:7603:7e4a]) by smarthost1.sentex.ca (8.15.2/8.15.2) with ESMTP id tAOFgbcZ042135; Tue, 24 Nov 2015 10:42:38 -0500 (EST) (envelope-from mike@sentex.net) Subject: Re: ZFS - poor performance with "large" directories To: Albert Cervin , Adam Vande More References: Cc: "freebsd-stable@freebsd.org" From: Mike Tancsa Organization: Sentex Communications Message-ID: <5654855F.2070502@sentex.net> Date: Tue, 24 Nov 2015 10:42:23 -0500 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.75 X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Nov 2015 15:42:40 -0000 On 11/24/2015 10:26 AM, Albert Cervin wrote: > vfs.zfs.txg.timeout is already verified to be 5 (the default). I have > also turned off atime and vfs.zfs.arc_meta_limit is 1287906304. > > "Do you have any memory pressures on your server ? Have a look at this > thread" > > The server has 4 cores and 8Gb of memory and there is no memory > pressure on the server. Thanks, will look at the thread! > > The setup is _really_ simple with just a single pool and no datasets. > > Any more ideas? 8G is not that much really. In the thread they suggested increasing the meta limit so that the giant directory can fit into cache. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/