From owner-freebsd-current@FreeBSD.ORG Mon Dec 20 23:29:35 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 793BD106564A; Mon, 20 Dec 2010 23:29:35 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout023.mac.com (asmtpout023.mac.com [17.148.16.98]) by mx1.freebsd.org (Postfix) with ESMTP id 5FA038FC08; Mon, 20 Dec 2010 23:29:35 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; CHARSET=US-ASCII Received: from cswiger1.apple.com ([17.209.4.71]) by asmtp023.mac.com (Oracle Communications Messaging Exchange Server 7u4-20.01 64bit (built Nov 21 2010)) with ESMTPSA id <0LDR00J732L69Y60@asmtp023.mac.com>; Mon, 20 Dec 2010 15:29:30 -0800 (PST) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.2.15,1.0.148,0.0.0000 definitions=2010-12-20_06:2010-12-20, 2010-12-20, 1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 ipscore=0 suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx engine=6.0.2-1010190000 definitions=main-1012200141 From: Chuck Swiger In-reply-to: <20101220231005.GA68477@freebsd.org> Date: Mon, 20 Dec 2010 15:29:30 -0800 Message-id: <3B3E7B72-C7C6-46F4-9DD9-0D82194FE068@mac.com> References: <20101220231005.GA68477@freebsd.org> To: Alexander Best X-Mailer: Apple Mail (2.1082) Cc: freebsd-current@freebsd.org Subject: Re: two ata write chaching request X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 20 Dec 2010 23:29:35 -0000 On Dec 20, 2010, at 3:10 PM, Alexander Best wrote: > 1) write caching to be turned on and off for individual hdds > (i.e. hw.ata.X.wc) and > 2) to be able to turn write chaching on and off on the fly. NetBSD's dkctl allows one to enable and disable read or write caches on a per-device basis, on the fly. Presumably atacontrol or whatever the new ada / ACHI driver uses for control would be the FreeBSD equivalent.... Regards, -- -Chuck