From owner-freebsd-stable@FreeBSD.ORG Wed Feb 15 08:53:43 2012 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 A73F91065672 for ; Wed, 15 Feb 2012 08:53:43 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id 0D7A48FC0C for ; Wed, 15 Feb 2012 08:53:42 +0000 (UTC) Received: from skuns.kiev.zoral.com.ua (localhost [127.0.0.1]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id q1F8rVRx096567 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Wed, 15 Feb 2012 10:53:31 +0200 (EET) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5) with ESMTP id q1F8rVhY003251; Wed, 15 Feb 2012 10:53:31 +0200 (EET) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5/Submit) id q1F8rVwE003250; Wed, 15 Feb 2012 10:53:31 +0200 (EET) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Wed, 15 Feb 2012 10:53:31 +0200 From: Konstantin Belousov To: Adam Vande More Message-ID: <20120215085331.GV3283@deviant.kiev.zoral.com.ua> References: <4F27C04F.7020400@omnilan.de> <4F27C7C7.3060807@os2.kiev.ua> <4F37F81E.7070100@os2.kiev.ua> <4F38AF69.6010506@os2.kiev.ua> <20120213132821.GA78733@in-addr.com> <20120214200258.GA29641@server.vk2pj.dyndns.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="dRLJIiDvVt9dROG4" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-3.9 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: freebsd-stable@freebsd.org, Peter Jeremy Subject: Re: disk devices speed is ugly 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: Wed, 15 Feb 2012 08:53:43 -0000 --dRLJIiDvVt9dROG4 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Feb 15, 2012 at 12:27:19AM -0600, Adam Vande More wrote: > On Tue, Feb 14, 2012 at 10:50 PM, Scott Long wrote: >=20 > > > > Any filesystem that uses bread/bwrite/cluster_read are already using the > > "generic caching subsystem" that you propose. This includes UDF, CD966= 0, > > MSDOS, NTFS, XFS, ReiserFS, EXT2FS, and HPFS, i.e. every local storage > > filesystem in the tree except for ZFS. Not all of them implement > > VOP_GETPAGES/VOP_PUTPAGES, but those are just optimizations for the vno= de > > pager, not requirements for using buffer-cache services on block device= s. > > As Kostik pointed out in a parallel email, the only thing that was rem= oved > > from FreeBSD was the userland interface to cached devices via /dev node= s. > > >=20 > Does this mean the Architecture Handbook page is wrong?: >=20 > http://www.freebsd.org/doc/en/books/arch-handbook/driverbasics-block.html No, why did you decided that it is wrong ? --dRLJIiDvVt9dROG4 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk87cooACgkQC3+MBN1Mb4j3aACgreebK3nd5t1pmZmmyny5tthF 0PwAmwSPjkEevUZ+9Nlou65oinigP44s =6i3v -----END PGP SIGNATURE----- --dRLJIiDvVt9dROG4--