From owner-freebsd-fs Wed May 16 16:58:29 2001 Delivered-To: freebsd-fs@freebsd.org Received: from smtp10.phx.gblx.net (smtp10.phx.gblx.net [206.165.6.140]) by hub.freebsd.org (Postfix) with ESMTP id 19FE637B422 for ; Wed, 16 May 2001 16:58:27 -0700 (PDT) (envelope-from tlambert@usr01.primenet.com) Received: (from daemon@localhost) by smtp10.phx.gblx.net (8.9.3/8.9.3) id QAA52596; Wed, 16 May 2001 16:58:25 -0700 Received: from usr01.primenet.com(206.165.6.201) via SMTP by smtp10.phx.gblx.net, id smtpdHURsya; Wed May 16 16:58:20 2001 Received: (from tlambert@localhost) by usr01.primenet.com (8.8.5/8.8.5) id QAA27898; Wed, 16 May 2001 16:59:51 -0700 (MST) From: Terry Lambert Message-Id: <200105162359.QAA27898@usr01.primenet.com> Subject: Re: UFS to FAT32 To: bde@zeta.org.au (Bruce Evans) Date: Wed, 16 May 2001 23:59:41 +0000 (GMT) Cc: sparvu@cc.hut.fi (Stefan Parvu), freebsd-fs@FreeBSD.ORG, fbsdq@yahoo.com In-Reply-To: from "Bruce Evans" at May 16, 2001 07:57:05 PM X-Mailer: ELM [version 2.5 PL2] MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > I tested FreeBSD 4.3-RELEASE doing this : > > > > 1. mount /win98 partition as rw only. Move from BSD partition to FAT32 a > > file of 500MB. Time around 25min. System really slow. CPU as idle around > > 99% but vmstat reported a lot of blocked processes(2to6). Can't work > > anymore in the box until de copy operation finished. > > This is probably caused by new (in 4.3) default of write caching turned > off for ATA drives. I'm not sure why it blocks so many processes. > It should only make the system unusable when many processes other than > the copy hog want to access the disk :-]. It happens because it puts so many requests in line in front of all the other requests in your system. The line to get to the disk is FIFO, not fair-share. 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-fs" in the body of the message