From owner-freebsd-hardware@FreeBSD.ORG Mon Sep 23 15:58:44 2013 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id D6EB2FC2; Mon, 23 Sep 2013 15:58:44 +0000 (UTC) (envelope-from rp_freebsd@mac.com) Received: from st11p00mm-asmtp002.mac.com (st11p00mm-asmtp002.mac.com [17.172.81.1]) by mx1.freebsd.org (Postfix) with ESMTP id AE5E226BD; Mon, 23 Sep 2013 15:58:44 +0000 (UTC) Received: from [192.168.1.3] (c-98-207-91-59.hsd1.ca.comcast.net [98.207.91.59]) by st11p00mm-asmtp002.mac.com (Oracle Communications Messaging Server 7u4-27.08(7.0.4.27.7) 64bit (built Aug 22 2013)) with ESMTPSA id <0MTL00MFW2X9L820@st11p00mm-asmtp002.mac.com>; Mon, 23 Sep 2013 14:58:38 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8794,1.0.431,0.0.0000 definitions=2013-09-23_01:2013-09-22,2013-09-23,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1308280000 definitions=main-1309230071 User-Agent: Microsoft-MacOutlook/14.3.7.130812 Date: Mon, 23 Sep 2013 07:58:19 -0700 Subject: Re: What's the state of AF-4Kn support? From: Ravi Pokala Sender: Ravi Pokala To: Jia-Shiun Li Message-id: Thread-topic: What's the state of AF-4Kn support? In-reply-to: MIME-version: 1.0 Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7bit Cc: freebsd-hackers@freebsd.org, "freebsd-hardware@freebsd.org" X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Sep 2013 15:58:44 -0000 -----Original Message----- From: Jia-Shiun Li Date: Sunday, September 22, 2013 11:22 PM To: Ravi Pokala Cc: "freebsd-hardware@freebsd.org" , Subject: Re: What's the state of AF-4Kn support? >On Wed, Sep 18, 2013 at 10:49 PM, Ravi Pokala wrote: >> >>... > >CC -hackers. > >Thanks for the clarification. Is there any 4Kn HDDs shopping now? I am >not aware of any. Good question. I had the impression that some currently shipping drives were AF-4Kn, but spot-checking some of the drives listed in src/cam/ata/ata_da.c::ada_quirk_table[] against their datasheets, suggests that they're AF-512e. So, their being flagged w/ ADA_Q_4K is "just" a performance optimization. >BTW I believe UFS and ZFS have proper design for 4K-sectors, but FreeBSD >needs some ecosystem connections to get samples early to test, >incorporate supports and validate for it. Or we will need to wait until >it appears on market and someone got caught into some kind of bugs. Yeah, based on my reading of the code, it looks like the ATACAM layer and higher (GEOM, filesystems) take the physical block size into account. That just leaves the bootstrap code. Now that I've taken a second look, it seems as though at least 'pmbr' only works in terms of 512 bytes. :-( WRT to getting samples, it may be possible to share some w/ appropriate members of the community; who would those people be? >Regards, >Jia-Shiun. Thanks, rp