From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lists.gentoo.org (pigeon.gentoo.org [208.92.234.80]) by finch.gentoo.org (Postfix) with ESMTP id 94AC11381F3 for ; Wed, 18 Sep 2013 17:04:59 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 931CDE0B80; Wed, 18 Sep 2013 17:04:52 +0000 (UTC) Received: from mail-bk0-f52.google.com (mail-bk0-f52.google.com [209.85.214.52]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (No client certificate requested) by pigeon.gentoo.org (Postfix) with ESMTPS id 69DAEE0B1E for ; Wed, 18 Sep 2013 17:04:51 +0000 (UTC) Received: by mail-bk0-f52.google.com with SMTP id e11so2895737bkh.39 for ; Wed, 18 Sep 2013 10:04:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; bh=LkhhowT6io3pAnO1e6wNYJtv/+fbF5peXQwDkHHlguQ=; b=DTvYRWxrHO63ROP1ADvYQMXBCeikmNZRCbh0gIQaQMa99dbP3lVCQSgZBeJligZbbp /jE1/4afJNSK+hajH6jjnQlhIbWMcm9lj77rjv81GQdYJKMrSou/XZT47V9+9gxHGO2p k9T7xawDdw9FVB06z2b7SUK8k5LTYnweBU9pABQbW0UyfRkmGTJxh2EQc7xRQNARJZ4K dVk2RxYr7kVR/A4jUluWuknNOQ9mNl8Bc+pCFNk99aHucRsrt1b9GAW4L+H9bQ6q7ryk n5IPbtSb9YMHbUo4Rtt/+XCsPN9KNDjExJWMgW2MO0qL6Q/t+9wStpI5ybfLibN6FXK5 H3dQ== X-Received: by 10.204.224.142 with SMTP id io14mr13152830bkb.27.1379523889974; Wed, 18 Sep 2013 10:04:49 -0700 (PDT) Received: from [192.168.178.21] (p3E9E6AB9.dip0.t-ipconnect.de. [62.158.106.185]) by mx.google.com with ESMTPSA id nv4sm1363065bkb.3.1969.12.31.16.00.00 (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 18 Sep 2013 10:04:49 -0700 (PDT) Message-ID: <5239DD31.9080209@googlemail.com> Date: Wed, 18 Sep 2013 19:04:49 +0200 From: Volker Armin Hemmann User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130807 Thunderbird/17.0.8 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] ZFS References: <523898A3.7000404@googlemail.com> <523978b4.H704k8Gaca/dZ9jF%Joerg.Schilling@fokus.fraunhofer.de> In-Reply-To: <523978b4.H704k8Gaca/dZ9jF%Joerg.Schilling@fokus.fraunhofer.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Archives-Salt: 9c6a9cb5-69be-41d9-80a3-8a053028fdc9 X-Archives-Hash: 7d989e20624d8b4b86dfa20647157afe Am 18.09.2013 11:56, schrieb Joerg Schilling: > Volker Armin Hemmann wrote: > >> turn off readahead. ZFS' own readahead and the kernel's clash - badly. >> Turn off kernel's readahead for a visible performance boon. > You are probably not talking about ZFS readahead but about the ARC. > > Jörg > which does prefetching. So yes.