Subject: Re: port-hp300/496: hp300 port panics after "reboot"
To: None <firstname.lastname@example.org>
From: Charles M. Hannum <email@example.com>
Date: 09/25/1994 20:14:10
This does not happen on any of my hp300-based boxen, which includes:
It does happen occasionally on my 425 with 32MB. I've not had the
time or patience recently to look at it.
However, on all of my machines, I have pmap problems if I have
MAPPEDCOPY in the kernel config.
I've never actually tried that.
Also, all of
my 32 meg boxen (with the exception of the 433) are quirky...Like they
just `freeze', and occasionally panic with `out of address space', [...]
Never seen that.
For my own personal edification (sp?), can someone please enlighten me on
just exactly what MAPPEDCOPY is supposed to accomplish?
It's supposed to improve copyin/copyout performance for large
transfers (like file system blocks), by avoiding the use of the `movs'
instruction. Another way to accomplish this would be to move the
kernel and the user code into the same address space, which I plan to
experiment with when I have more time.