From owner-freebsd-virtualization@FreeBSD.ORG Mon Dec 15 09:44:32 2014 Return-Path: Delivered-To: freebsd-virtualization@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 4C1A33DC for ; Mon, 15 Dec 2014 09:44:32 +0000 (UTC) Received: from mbox1.develooper.com (mbox1.develooper.com [207.171.7.178]) by mx1.freebsd.org (Postfix) with ESMTP id 31C4A102 for ; Mon, 15 Dec 2014 09:44:31 +0000 (UTC) Received: from mbox1.develooper.com (mbox1.develooper.com [127.0.0.1]) by mbox1.develooper.com (Postfix) with ESMTP id 262C3175C91 for ; Mon, 15 Dec 2014 01:24:11 -0800 (PST) Received: (qmail 12697 invoked from network); 15 Dec 2014 09:22:13 -0000 Received: from c-50-161-96-117.hsd1.ca.comcast.net (HELO ?10.0.200.101?) (ask@mail.dev@50.161.96.117) by smtp.develooper.com with ESMTPA; 15 Dec 2014 09:22:13 -0000 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 8.1 \(1993\)) Subject: Re: Unsupported cmd:c4 (ada0:ahcich0:0:0:0): READ_MUL. ACB: c4 00 00 00 00 40 00 00 00 00 01 00 From: =?utf-8?Q?Ask_Bj=C3=B8rn_Hansen?= In-Reply-To: Date: Mon, 15 Dec 2014 01:22:11 -0800 Content-Transfer-Encoding: quoted-printable Message-Id: <9AF2F3EC-E54D-49D6-A9E0-AB3163CEFCB2@develooper.com> References: To: Neel Natu X-Mailer: Apple Mail (2.1993) Cc: "freebsd-virtualization@freebsd.org" X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 15 Dec 2014 09:44:32 -0000 [ It looks like I didn't send this earlier ] > Are you, by any chance, setting the tunable 'hw.ata.ata_dma' to 0 to > disable DMA? >=20 > I ask this because in the dmesg above you have: > ada0: 300.000MB/s transfers (SATA 2.x, PIO4, PIO 8192bytes) >=20 > In my setup, I get this instead: > ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes) Hi Neel, Good eyes, indeed I do! Very nice. # grep -rh ata_dma . echo 'hw.ata.ata_dma=3D"0"' >> boot/device.hints My VCS log says I added it 6 years ago -- "disable DMA for better = Soekris/Alix support=E2=80=9D, which probably seemed like a very = specific commit message at the time. For what it's worth the system is = booting fine without the setting on my alix and soekris boards, too. Thank you! The ZFS devmode didn't seem to make a difference for this; but setting = it to 'dev' did fix some warnings I was getting when making snapshots, = so that was useful too. Thank you, Allan. Ask=