From owner-freebsd-stable@FreeBSD.ORG Tue Feb 12 09:21:03 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1027916A46D for ; Tue, 12 Feb 2008 09:21:03 +0000 (UTC) (envelope-from tevans.uk@googlemail.com) Received: from ug-out-1314.google.com (ug-out-1314.google.com [66.249.92.172]) by mx1.freebsd.org (Postfix) with ESMTP id 8405613C45B for ; Tue, 12 Feb 2008 09:21:01 +0000 (UTC) (envelope-from tevans.uk@googlemail.com) Received: by ug-out-1314.google.com with SMTP id y2so694915uge.37 for ; Tue, 12 Feb 2008 01:21:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=gamma; h=domainkey-signature:received:received:subject:from:to:cc:in-reply-to:references:content-type:date:message-id:mime-version:x-mailer; bh=4NNNyt4AiIDzu6ElYIL0i5b3rI1gBRAE2vMXgqGc9qM=; b=iyaXtQZM94HNeAolZ8LSMGxgGa7LaDQTq+1NnP7qC21KkOYEi9yF8FwgRSnP4dlcYmxWWoQ17cIJdPF+fzdGUrZna3Tl8VH+iO7NjRpa8Mhs1uSANKLSdCFRfbtxqMhaJKa3hkASPfcmIJrp9q3PAF3dz+y+hqmcW2BON1z+EtQ= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date:message-id:mime-version:x-mailer; b=vVTapcKrmtFgkOX3eHhZqPGYmEabE0joX5oDMj8Ehc4aiavV3/udisbwGmSrqrMzQA6at201RANyPcaO8DluqN8GSyGy8G7AwnbzuuhoU1EXqcov53ns1QOQGCUID+ocNwJWSfP5ncsVSBf6pDX53FGwSl5jvmT4200Mv4XxPlY= Received: by 10.66.244.2 with SMTP id r2mr309530ugh.64.1202808060574; Tue, 12 Feb 2008 01:21:00 -0800 (PST) Received: from ?127.0.0.1? ( [217.206.187.79]) by mx.google.com with ESMTPS id g11sm9543632gve.6.2008.02.12.01.20.58 (version=SSLv3 cipher=RC4-MD5); Tue, 12 Feb 2008 01:20:59 -0800 (PST) From: Tom Evans To: Dominic Fandrey In-Reply-To: <47ACA0E4.2030905@bsdforen.de> References: <47A9F835.1060200@bsdforen.de> <47AA0696.5020109@bsdforen.de> <7872AB6E-21DA-4E2D-93C0-D07CFA3A7E47@mac.com> <47AA0E3E.4020304@bsdforen.de> <47ABF66E.4040807@bsdforen.de> <1202485501.2126.34.camel@localhost> <47AC7FF6.1020801@bsdforen.de> <1202491071.2126.42.camel@localhost> <47ACA0E4.2030905@bsdforen.de> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="=-N9GY/K+J4P+l5kaEyEn6" Date: Tue, 12 Feb 2008 09:20:57 +0000 Message-Id: <1202808057.2126.45.camel@localhost> Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 FreeBSD GNOME Team Port Cc: "Carlos A. M. dos Santos" , freebsd-stable@freebsd.org Subject: Re: RELENG_7: interrupt eating whole cpu core X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Feb 2008 09:21:03 -0000 --=-N9GY/K+J4P+l5kaEyEn6 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On Fri, 2008-02-08 at 19:35 +0100, Dominic Fandrey wrote: > Tom Evans wrote: > > On Fri, 2008-02-08 at 17:14 +0100, Dominic Fandrey wrote: > >> Tom Evans wrote: > >>> If I try to turn on DMA, I just get WDMA2, which just doesn't cut it: > >> I think any DMA mode is fast enough to handle a DVD drive. There's jus= t no=20 > >> necessity for more. > >> > >=20 > > WDMA is not UDMA. Any UDMA variant would be enough. WDMA2 provides a > > maximum of 16MiB/s, which will frequently lead to buffer underruns > > viewing a DVD. UDMA2 provides a maximum of 33MiB/s, which IS plenty. >=20 > 16MB/s is exactly what is needed for 12x DVD access. I think this is the = usual=20 > speed for a Notebook drive nowadays and it suffices for me. >=20 > >>>> # atacontrol mode acd0 udma5 > >>> current mode =3D WDMA2 > >> Same as for me. I'm satisfied with the speed of the drive. > >=20 > > I'm rarely satisfied - I'm quite often not bothered enough to pursue :) >=20 > Well, if 12x speed is not enough for you, you have to use an external dri= ve.=20 > This is not a driver issue. It's just what your drive supports. The chipset supports UDMA6, the drive supports UDMA6, I should be happy with WDMA2 because 'thats what works'? Thanks for your 'help'. I'll continue on here from myself. --=-N9GY/K+J4P+l5kaEyEn6 Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBHsWTzlcRvFfyds/cRAh/1AJ9y8rBVXDGlscE/RYl9leKaRTlH2gCfRify IB8efrA5J0jbLamTIuMyhms= =/+WT -----END PGP SIGNATURE----- --=-N9GY/K+J4P+l5kaEyEn6--