From owner-freebsd-chat Wed Jul 14 19: 0:52 1999 Delivered-To: freebsd-chat@freebsd.org Received: from smtp03.primenet.com (smtp03.primenet.com [206.165.6.133]) by hub.freebsd.org (Postfix) with ESMTP id 189CF15402 for ; Wed, 14 Jul 1999 19:00:48 -0700 (PDT) (envelope-from tlambert@usr07.primenet.com) Received: (from daemon@localhost) by smtp03.primenet.com (8.8.8/8.8.8) id SAA10739; Wed, 14 Jul 1999 18:59:54 -0700 (MST) Received: from usr07.primenet.com(206.165.6.207) via SMTP by smtp03.primenet.com, id smtpd010729; Wed Jul 14 18:59:48 1999 Received: (from tlambert@localhost) by usr07.primenet.com (8.8.5/8.8.5) id SAA10740; Wed, 14 Jul 1999 18:59:47 -0700 (MST) From: Terry Lambert Message-Id: <199907150159.SAA10740@usr07.primenet.com> Subject: Re: Known MMAP() race conditions ... ? To: davids@webmaster.com (David Schwartz) Date: Thu, 15 Jul 1999 01:59:46 +0000 (GMT) Cc: davids@webmaster.com, Doug@gorean.org, chat@FreeBSD.ORG In-Reply-To: <000201bece25$066b7510$021d85d1@youwant.to> from "David Schwartz" at Jul 14, 99 11:16:42 am X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > threads. Log-based system. There's nothing I know of in any UNIX > > That should read "log-based file system". I'm talking about NTFS. And it > beats an fsck any day. NTFS is significantly slower that even an unmodified FFS in sync mode. A modified FFS (i.e. with soft updates) does not require a fsck, but no one has bothered to write a cylinder group bitmap cleaner for it, which could easily run in the background. That, and disable the "clean bit" code, and distinguish "disk related OS failure" from "non-disk related OS failure" for the purposes of doing a full fsck on disk related OS failures. Note also that SGI is supposed to be releasing XFS sources some time soon; IMO, it would be trivial to port it; I don't know if I would bother with the plex manager (I like Simon's code for that), given that their non-unified VM and buffer cache have the buffer cache sandwiched between XFS and the manager. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message