From owner-freebsd-hackers@FreeBSD.ORG Sun Dec 9 04:19:09 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 02814F12 for ; Sun, 9 Dec 2012 04:19:09 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-vc0-f182.google.com (mail-vc0-f182.google.com [209.85.220.182]) by mx1.freebsd.org (Postfix) with ESMTP id A2DD78FC0C for ; Sun, 9 Dec 2012 04:19:08 +0000 (UTC) Received: by mail-vc0-f182.google.com with SMTP id fo14so2022945vcb.13 for ; Sat, 08 Dec 2012 20:19:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=riEmCS03Q2u44KoM5oDb9wSHjw9MbdJH6utdSTNmTTs=; b=m0ebBYe2GmIdfgiaQsvf0wobykkRv32HMozXdXxhRv8B152mKp6hDEaO/JHWsZgB1d 1QRvTWCD5XBzE/aLO7XdVRfSDQZ6o7aVzd4ZAHBs2p68MD00+rXLp2zS1jgZe19Jek+2 nr1ljsbDq2KVOTK4TTxfb24n95ZDvt42hUEPpLPiPnFlSUMi382UGL+O54gOV+sC2iwH +yfAQdrkXocN0vzFbZpfdyKsEYJRi2L5O00DGWFQLiUDu0pBcNoLbHU2I1ZvBszvXSIe w8DuKpMQa5mhIKKHFulBYe0JryXTeSd9qRCstZV5KuX5TZ3U3WKJWx9nMtrRVEQhKE7L gL6Q== MIME-Version: 1.0 Received: by 10.52.67.133 with SMTP id n5mr5793481vdt.24.1355026747806; Sat, 08 Dec 2012 20:19:07 -0800 (PST) Sender: adrian.chadd@gmail.com Received: by 10.58.201.202 with HTTP; Sat, 8 Dec 2012 20:19:07 -0800 (PST) In-Reply-To: References: <20121209014547.238070@gmx.com> <1830.1355025154@tristatelogic.com> <20121208230433.2c54f44a@kan.dyndns.org> Date: Sat, 8 Dec 2012 20:19:07 -0800 X-Google-Sender-Auth: dsk0GICkOAfo3TbhC9Hy3xLLPwQ Message-ID: Subject: Re: FreeBSD for serious performance? (was: Re: 9.x -- New Install -- serious partition misalignment) From: Adrian Chadd To: Eitan Adler Content-Type: text/plain; charset=ISO-8859-1 Cc: freebsd-hackers@freebsd.org, "Ronald F. Guilmette" X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 09 Dec 2012 04:19:09 -0000 Hi, Yes. atacam supports NCQ. The older IDE/ATA code doesn't support NCQ. The CAM ATA code (ie, atacam) supports it if the drive supports it. So, the "FreeBSD doesn't do NCQ" point is incorrect. If you don't believe me - look in sys/cam/ata/ata_da.c, look for ata_ncq_cmd(). Adrian