Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753506AbWKCTvr (ORCPT ); Fri, 3 Nov 2006 14:51:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753504AbWKCTvq (ORCPT ); Fri, 3 Nov 2006 14:51:46 -0500 Received: from emailhub.stusta.mhn.de ([141.84.69.5]:28690 "HELO mailout.stusta.mhn.de") by vger.kernel.org with SMTP id S1753492AbWKCTvp (ORCPT ); Fri, 3 Nov 2006 14:51:45 -0500 Date: Fri, 3 Nov 2006 20:51:46 +0100 From: Adrian Bunk To: Mikulas Patocka Cc: =?iso-8859-1?Q?J=F6rn?= Engel , linux-kernel@vger.kernel.org Subject: Re: New filesystem for Linux Message-ID: <20061103195146.GK13381@stusta.de> References: <20061102235920.GA886@wohnheim.fh-wedel.de> <20061103101901.GA11947@wohnheim.fh-wedel.de> <20061103122126.GC11947@wohnheim.fh-wedel.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1330 Lines: 37 On Fri, Nov 03, 2006 at 02:31:46PM +0100, Mikulas Patocka wrote: > >>>I am fully aware the counters are effectively 48-bit. If they were > >>>just 32-bit, you would likely have hit the problem yourself already. > >> > >>Given the seek time 0.01s, 31-bit value would last for minimum time of 248 > >>days when doing only syncs and nothing else. 47-bit value will last for > >>reasonably long. > > > >So you can at most do one transaction per drive seek? That would > >definitely solve the overflow case, but hardly sounds like a > >high-performance filesystem. :) > > Really it can batch any number of modifications into one transaction > (unless fsync or sync is called). Transaction is closed only on > fsync/sync, if 2 minutes pass (can be adjusted) or when the disk runs out > of space. O_DIRECT ? O_SYNC ? > Mikulas cu Adrian -- "Is there not promise of rain?" Ling Tan asked suddenly out of the darkness. There had been need of rain for many days. "Only a promise," Lao Er said. Pearl S. Buck - Dragon Seed - 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/