From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Daniel Phillips" Subject: Re: [Patch] document ext3 requirements (was Re: [RFD] Incremental fsck) Date: Tue, 15 Jan 2008 18:44:26 -0500 Message-ID: <4d47a5d10801151544k3bc50223ob69c25d8732e3f12@mail.gmail.com> References: <200801090022.55589.a1426z@gawab.com> <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> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "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 smtp-out.google.com ([216.239.33.17]:57852 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751298AbYAOXoc (ORCPT ); Tue, 15 Jan 2008 18:44:32 -0500 Received: from zps38.corp.google.com (zps38.corp.google.com [172.25.146.38]) by smtp-out.google.com with ESMTP id m0FNiRfl020496 for ; Tue, 15 Jan 2008 23:44:27 GMT Received: from wa-out-1112.google.com (wagm33.prod.google.com [10.114.214.33]) by zps38.corp.google.com with ESMTP id m0FNgFvA002703 for ; Tue, 15 Jan 2008 15:44:26 -0800 Received: by wa-out-1112.google.com with SMTP id m33so64709wag.8 for ; Tue, 15 Jan 2008 15:44:26 -0800 (PST) In-Reply-To: <20080115230714.GC3573@elf.ucw.cz> Content-Disposition: inline Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Jan 15, 2008 6:07 PM, Pavel Machek wrote: > I had write cache enabled on my main computer. Oops. I guess that > means we do need better documentation. Writeback cache on disk in iteself is not bad, it only gets bad if the disk is not engineered to save all its dirty cache on power loss, using the disk motor as a generator or alternatively a small battery. It would be awfully nice to know which brands fail here, if any, because writeback cache is a big performance booster. Regards, Daniel