From owner-freebsd-hackers Mon Feb 5 03:31:52 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id DAA20594 for hackers-outgoing; Mon, 5 Feb 1996 03:31:52 -0800 (PST) Received: from labinfo.iet.unipi.it (labinfo.iet.unipi.it [131.114.9.5]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id DAA20585 for ; Mon, 5 Feb 1996 03:31:25 -0800 (PST) Received: from localhost (luigi@localhost) by labinfo.iet.unipi.it (8.6.5/8.6.5) id MAA20777; Mon, 5 Feb 1996 12:28:30 +0100 From: Luigi Rizzo Message-Id: <199602051128.MAA20777@labinfo.iet.unipi.it> Subject: Re: FAT filesystem performance To: joerg_wunsch@uriah.heep.sax.de Date: Mon, 5 Feb 1996 12:28:29 +0100 (MET) Cc: freebsd-hackers@FreeBSD.ORG In-Reply-To: <199602050950.KAA04667@uriah.heep.sax.de> from "J Wunsch" at Feb 5, 96 10:50:13 am X-Mailer: ELM [version 2.4 PL23] Content-Type: text Sender: owner-hackers@FreeBSD.ORG Precedence: bulk > > A high performance FAT filesystem is certainly useful, but it might > > require a lot of work. > > Yes, but we hardly need it. (Both, stability and performance > improvement.) If the caching situation can cause errors, perhaps > write an dosfsck(8) as well. It's a tradeoff. FAT is not our primarily FS, we just need it for compatibility (or for special situations, e.g. when someone wants to run FreeBSD within the MSDOS slice. But as someone suggested, there are better ways to achieve this, e.g. build a large contiguous file and fake a disklabel which spans all the blocks within the file). Stability problems can probably be fixed with relatively little effort. If we can get performance at low price (by recycling some piece of code already in the system, e.g. the VM cache) fine. If someone then wants to do more serious work on performance improvement, it's all up to them. Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================