Date: Sun, 19 Apr 1998 04:56:51 -0400 From: Mark Mayo <mark@vmunix.com> To: Bruce Evans <bde@zeta.org.au> Cc: hardware@FreeBSD.ORG Subject: Re: best wdc0 flags ? Message-ID: <19980419045651.63169@vmunix.com> In-Reply-To: <199804190652.QAA23558@godzilla.zeta.org.au>; from Bruce Evans on Sun, Apr 19, 1998 at 04:52:34PM %2B1000 References: <199804190652.QAA23558@godzilla.zeta.org.au>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, Apr 19, 1998 at 04:52:34PM +1000, Bruce Evans wrote: > >Damn.. I just tried doing a > > dd if=/dev/rwd0 of=/dev/null bs=1m count=1280 > >Any ideas what's going wrong here? > > Your BIOS is misconfigured or only supports slow PIO modes. I use AUTO > mode and checked that this gave 16.6MB/sec by looking at `systat -vmstat' > (interrupt overhead should be about 10/16.6 * 100% for a 10 MB/sec drive). > My BIOS also supports PIO modes 0, 1, 2, 3 and 4. The 10MB firehose > swamps at least PIO modes 0 and 1. I see what's happening now.. The boot drive on this system is a SCSI disk, and when I added the IDE drive the BIOS absolutely refused to boot off the SCSI (even though it was set to..) -- so I set the "primary master" to "NONE" and let the BIOS think there was only the SCSI. Naturally, FreeBSD picked up the IDE just fine, but apparently the controller is operating in PIO mode 0 or 1, and as you say it just can't keep up with the Fireball... Ugly situation. :-) The machine is remote, so playing around more is a pain. Perhaps I'll try setting the BIOS to "auto" like you said, but not run the IDE AutoDetect thing and see if that works.. otherwise I don't know how I can get it to boot off the damned SCSI drive without using a floppy (which makes me nervous since the box is far enough away to be a real pain to get on the console..) Thanks for the superb explanation. -Mark > > Bruce -- ------------------------------------------------------------------------ Mark Mayo mark@vmunix.com RingZero Comp. http://www.vmunix.com/mark finger mark@vmunix.com for my PGP key and GCS code ------------------------------------------------------------------------ "The problem is how do you build tools that understand your programs at a deeper semantic level." - James Gosling To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19980419045651.63169>