Date: Thu, 30 Aug 2001 18:28:51 +0800 From: "Rino Mardo" <rmardo@yahoo.com> To: "Mike Meyer" <mwm@mired.org>, "Trevin Chow" <tmchow@sfu.ca> Cc: <questions@freebsd.org> Subject: Re: Performance tuning and adding RAM Message-ID: <000b01c1314b$533d0260$0469a7cb@8189779819> References: <15245.52453.614096.245669@guru.mired.org><20010830004542.A80091-100000@benny.geektank.org> <15245.62127.417241.42347@guru.mired.org>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 is "hdparm" any different from this disk caches you're talking about? i noticed (with linux) in my p100 box that if i don't use hdparm the hd system runs about 30% slower. will using hdparm (in /etc/rc.local) make any difference? - ----- Original Message ----- From: Mike Meyer <mwm@mired.org> To: Trevin Chow <tmchow@sfu.ca> Cc: Mike Meyer <mwm@mired.org>; <questions@freebsd.org> Sent: Thursday, August 30, 2001 4:00 PM Subject: Re: Performance tuning and adding RAM > 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 -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 6.5.3 for non-commercial use <http://www.pgp.com>; iQA/AwUBO42k43ri0wX1dLwtEQLYGwCgy638w3/PIqPmW/lBxqJESnJtUIIAn3d8 PeIDqvAynNNQ8S3kTeGsy7ZF =OgDI -----END PGP SIGNATURE----- _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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