From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valdis.Kletnieks@vt.edu Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Date: Wed, 16 Jan 2008 07:20:36 -0500 Message-ID: <16153.1200486036@turing-police.cc.vt.edu> References: <200801090740.12989.a1426z@gawab.com> <70b6f0bf0801082345vf57951ey642e35c3d6e5194f@mail.gmail.com> <200801091452.14890.a1426z@gawab.com> <20080112145140.GB6751@mit.edu> <20080113171916.GB4132@ucw.cz> <20080113174125.5f39ac64@lxorguk.ukuu.org.uk> <20080115201653.GA5639@elf.ucw.cz> <20080115214325.GN155407@sgi.com> <20080115230714.GC3573@elf.ucw.cz> <4d47a5d10801151544k3bc50223ob69c25d8732e3f12@mail.gmail.com> <20080116115144.GE22460@elf.ucw.cz> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1200486036_2966P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Cc: Daniel Phillips , David Chinner , Alan Cox , Theodore Tso , Al Boldi , Valerie Henson , Rik van Riel , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org To: Pavel Machek Return-path: Received: from turing-police.cc.vt.edu ([128.173.14.107]:33828 "EHLO turing-police.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751481AbYAPMWU (ORCPT ); Wed, 16 Jan 2008 07:22:20 -0500 In-Reply-To: Your message of "Wed, 16 Jan 2008 12:51:44 +0100." <20080116115144.GE22460@elf.ucw.cz> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: --==_Exmh_1200486036_2966P Content-Type: text/plain; charset=us-ascii On Wed, 16 Jan 2008 12:51:44 +0100, Pavel Machek said: > I guess I should try to measure it. (Linux already does writeback > caching, with 2GB of memory. I wonder how important disks's 2MB of > cache can be). It serves essentially the same purpose as the 'async' option in /etc/exports (i.e. we declare it "done" when the other end of the wire says it's caught the data, not when it's actually committed), with similar latency wins. Of course, it's impedance-matching for bursty traffic - the 2M doesn't do much at all if you're streaming data to it. For what it's worth, the 80G Seagate drive in my laptop claims it has 8M, so it probably does 4 times as much good as 2M. ;) --==_Exmh_1200486036_2966P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFHjfaUcC3lWbTT17ARAuh8AKDuMO2z/LU9eaU+1QeS/6k6wZnRbwCgkF8o N8XX46OK6g53lJpdGWIbUgw= =n5XN -----END PGP SIGNATURE----- --==_Exmh_1200486036_2966P--