Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753609AbYFRLPs (ORCPT ); Wed, 18 Jun 2008 07:15:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752557AbYFRLPi (ORCPT ); Wed, 18 Jun 2008 07:15:38 -0400 Received: from mtagate1.uk.ibm.com ([195.212.29.134]:29778 "EHLO mtagate1.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752083AbYFRLPh convert rfc822-to-8bit (ORCPT ); Wed, 18 Jun 2008 07:15:37 -0400 Date: Wed, 18 Jun 2008 13:15:14 +0200 From: Maxim Shchetynin To: linux-fsdevel@vger.kernel.org Cc: Jan Engelhardt , Matthew Wilcox , linux-kernel@vger.kernel.org Subject: Re: AZFS file system proposal Message-ID: <20080618131514.7ea8af7e@mercedes-benz.boeblingen.de.ibm.com> In-Reply-To: References: <20080609104650.4f220492@mercedes-benz.boeblingen.de.ibm.com> <20080609125530.GF30405@parisc-linux.org> <20080610104919.504b9826@mercedes-benz.boeblingen.de.ibm.com> <20080617110655.59c915da@mercedes-benz.boeblingen.de.ibm.com> <20080617135722.374673b9@mercedes-benz.boeblingen.de.ibm.com> Organization: IBM Deutschland Entwicklung GmbH X-Mailer: Claws Mail 2.10.0 (GTK+ 2.12.0; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1698 Lines: 41 > >> >> (a) What is axonram? > >> >> (b) why is axonram direct_access, and my other devices (including > >> >> standard PC RAM) not? > >> > > >> >[Axonram is a module specific for IBM CellBlade and allows access to > >> >a DDR2 memory attached onto Axon controller.] You don't need > >> >direct_access and not azfs for main memory because there is already > >> >a pretty nice tmpfs for it. > >> > >> So the reason azfs could be useful is...? > > > >The "?" at the end of your sentence might mean a question. I would > >be really happy to give an answer on it if I could understand it. > > If one does not need direct_access nor azfs, and ext2 plus XIP minus > caching or tmpfs plus XIP can achieve the same effect, what can azfs > that we could not already do without azfs? Our users want to have a file system with bigger block sizes (64KB, 16MB, ...). They also don't want to keep metadata on DDR2 media, but to be able to use a complete DDR2 for their applications data. -- Mit freundlichen Grüßen / met vriendelijke groeten / avec regards Maxim V. Shchetynin Linux Kernel Entwicklung IBM Deutschland Entwicklung GmbH Linux für Cell, Abteilung 3250 Schönaicher Straße 220 71032 Böblingen Vorsitzender des Aufsichtsrats: Johann Weihen Geschäftsführung: Herbert Kircher Sitz der Gesellschaft: Böblingen Registriergericht: Amtsgericht Stuttgart, HRB 243294 Fahr nur so schnell wie dein Schutzengel fliegen kann! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/