From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934873AbXGYSkd (ORCPT ); Wed, 25 Jul 2007 14:40:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763908AbXGYSkT (ORCPT ); Wed, 25 Jul 2007 14:40:19 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:2052 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1763843AbXGYSkS (ORCPT ); Wed, 25 Jul 2007 14:40:18 -0400 Date: Wed, 25 Jul 2007 18:40:06 +0000 From: Pavel Machek To: Lindsay Roberts Cc: Matt Mackall , Andrew Morton , LKML , celinux-dev@tree.celinuxforum.org Subject: Re: [PATCH] fs: Add romfs version 2 Message-ID: <20070725184005.GD8225@ucw.cz> References: <8734b7880707122301m400294d4nf12072f949c95fa4@mail.gmail.com> <20070717013635.d6d0b124.akpm@linux-foundation.org> <20070717192100.GE11166@waste.org> <8734b7880707172016v530ce775p108910f7baf9de8e@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8734b7880707172016v530ce775p108910f7baf9de8e@mail.gmail.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > >> > block aligned regular file data to bring > >performance > >> > parity with ext2/3. This is about 225% of the read > >> > speed of the existing romfs. > > > >Doesn't that make these filesystems much bigger? By, on > >average, .5k > >per file? Or, if I'm understanding things correctly, > >~1k? > > Yes, my experience has been that it has been almost > chillingly close > to .5k per regular file increase in partition size. I > know in > applications in which size is utterly critical this may > be slightly > unattractive, but in cases where romfs is chosen for its > byte > reproducibility and read-only nature the > size/performance tradeoff is > fairly advantageous. If the fs is read-only.. can we do some tail packing and get _both_ speed and space efficiency? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html