Date: Wed, 16 May 2001 23:59:41 +0000 (GMT) From: Terry Lambert <tlambert@primenet.com> To: bde@zeta.org.au (Bruce Evans) Cc: sparvu@cc.hut.fi (Stefan Parvu), freebsd-fs@FreeBSD.ORG, fbsdq@yahoo.com Subject: Re: UFS to FAT32 Message-ID: <200105162359.QAA27898@usr01.primenet.com> In-Reply-To: <Pine.BSF.4.21.0105161918520.8593-100000@besplex.bde.org> from "Bruce Evans" at May 16, 2001 07:57:05 PM
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> > 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
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