Date: Thu, 30 Aug 2001 03:00:47 -0500 From: Mike Meyer <mwm@mired.org> To: Trevin Chow <tmchow@sfu.ca> Cc: Mike Meyer <mwm@mired.org>, <questions@freebsd.org> Subject: Re: Performance tuning and adding RAM Message-ID: <15245.62127.417241.42347@guru.mired.org> In-Reply-To: <20010830004542.A80091-100000@benny.geektank.org> References: <15245.52453.614096.245669@guru.mired.org> <20010830004542.A80091-100000@benny.geektank.org>
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Trevin Chow <tmchow@sfu.ca> types: > On Thu, 30 Aug 2001, Mike Meyer wrote: > > > For IDE drives, you disable this by setting the sysctl hw.ata.wc to 0, > > but it has to be done from the boot loader at boot time. If you are > > running 4.3-RELEASE, it's set off by default. If you're running > > something prior to 4.3-RELEASE, you may not be able to set it at > > all. The drive manufacturer may provide a DOS utility that will let > > you turn it off as well. > > > > If you are using SCSI disks, you can use the camcontrol modepage > > command to check and disable it. It's the WCE value on page 8; use > > "camcontrol modepage daX -m 8 -e" to start an editor, change the 1 to > > a 0, and then exit. > What will provide a "bigger" performance boost? Soft updates or IDE Cache > (hw.ata.wc)? Oh, leaving the disk caching enabled is definitely faster. After all, it's sort of like running a RAM disk through a slow interface. If you're going to do that, mount your file systems async buy a UPS, and make more frequent backups. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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