Date: Fri, 22 Jun 2001 09:20:05 -0700 (PDT) From: Peter Pentchev <roam@orbitel.bg> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/28339: Slow Disk performance on 4.3 (about half that on 4.2) Message-ID: <200106221620.f5MGK5J94656@freefall.freebsd.org>
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The following reply was made to PR misc/28339; it has been noted by GNATS. From: Peter Pentchev <roam@orbitel.bg> To: Matthew Williams <matthew@informatics.bangor.ac.uk> Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: misc/28339: Slow Disk performance on 4.3 (about half that on 4.2) Date: Fri, 22 Jun 2001 19:08:50 +0300 On Fri, Jun 22, 2001 at 08:38:12AM -0700, Matthew Williams wrote: > > >Number: 28339 > >Category: misc > >Synopsis: Slow Disk performance on 4.3 (about half that on 4.2) > >Originator: Matthew Williams > >Release: 4.3 > >Organization: > University of Wales, Bangor. UK. > >Environment: > FreeBSD HOSTNAME.sees.bangor.ac.uk 4.3-REALEASE FreeBSD 4.3-RELEASE #2: > Thu Jun 21 14:45:51 BST root@HOSTNAME.sees.bangor.ac.uk:/usr/src/sys/compile/P500 > i386 > >Description: > We use dd to install Windows onto a partition. Under 4.3 the performance has reduced dramatically. > I have experimented with a binary only install in 4.2 and 4.3 creating a file from > /dev/zero and dd-ing it on to a unmounted raw partition. > Under 4.2 I get an average throughput of about 6MB/sec but under 4.3 this > drops to 3.5MB/sec. 4.3 has IDE write caching off by default. To enable it, add this line: hw.ata.wc="1" to the /boot/loader.conf file, and reboot. G'luck, Peter -- "yields falsehood, when appended to its quotation." yields falsehood, when appended to its quotation. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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