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 C267E13800E for ; Fri, 10 Aug 2012 20:08:04 +0000 (UTC) Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 458EDE068C; Fri, 10 Aug 2012 20:07:25 +0000 (UTC) Received: from mail-lb0-f181.google.com (mail-lb0-f181.google.com [209.85.217.181]) by pigeon.gentoo.org (Postfix) with ESMTP id D2DA6E0539 for ; Fri, 10 Aug 2012 20:04:31 +0000 (UTC) Received: by lbbgk1 with SMTP id gk1so1064616lbb.40 for ; Fri, 10 Aug 2012 13:04:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:content-type; bh=LspI8qU3X6/rvbBd09xrSmvoVRZi0axbTfDSA2ILhew=; b=NcXg3ozU67btW3r17Vv1JEOca5dF2MMQiBuh2CDnCbo4CUf8JSTwxi9m8O5/IjI94n l1lDBpOfSQLnDx2QYZKG14nNWtrDTA6VLKefxH0ZZSLyWfb1i0UVhgJ/eGEGxuXKPccf 8b8uyFrDx9AerXWxktZt7VcADwEFWXdAnFrjA53EVbapqNGScWzDVkFTN25QxQ1QJ7L7 ZDEPfwuy8Cx6UkFRVOfLfGCzLpdFGGZ7n6KuVFHSr4APruNGqAQN2D+UHhngefg+DnYT a5A9PA/ZdlTovSb4itE3G93YmMSOX3Sz8O2fR1huYTsdUSwlaJq5AemsXiSKox7VQtMT n/QQ== Received: by 10.112.17.195 with SMTP id q3mr2983300lbd.34.1344629070772; Fri, 10 Aug 2012 13:04:30 -0700 (PDT) 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 Sender: paul.hartman@gmail.com Received: by 10.112.29.132 with HTTP; Fri, 10 Aug 2012 13:04:10 -0700 (PDT) In-Reply-To: <20120810212213.0ce6e810@khamul.example.com> References: <20120810212213.0ce6e810@khamul.example.com> From: Paul Hartman Date: Fri, 10 Aug 2012 15:04:10 -0500 X-Google-Sender-Auth: t1KunScxDzD3uhTFAT7S4OsE_V8 Message-ID: Subject: Re: [gentoo-user] new installation (ssd, new udev, grub2) To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=ISO-8859-1 X-Archives-Salt: b405d6b4-892a-4d36-ac1a-0aa7c27a9897 X-Archives-Hash: e8ca170196722e0e563d5898d5952a23 On Fri, Aug 10, 2012 at 2:22 PM, Alan McKinnon wrote: > You also don't need an IO scheduler - ssd access is random like > RAM, no heads moving in and out so no sector ordering to worry about. > Configure the scheduler as NOOP in kernel config if all drives are ssd's I've read some contradictory reports about the best scheduler for SSD. Apparently some SSD controllers are tuned for sequential reads/writes (drives that lean heavily on compression, I would imagine?) and for those drives cfq or deadline may be the better choice. I would try them all and use whatever works best for your workload.