21 Feb
2006
21 Feb
'06
4:28 p.m.
On Tue, 2006-02-21 at 13:19 -0600, Jan Depner wrote:
There's a bunch of information on that on my site
(albeit outdated).
Tuning the disk drives is a must and it *will* help but there are
instances where the disk drive is busy and you can't get to it no
matter
how well tuned it is. I prefer to minimize any chance of that. You
have to remember that unless you're running RTLinux or VXWorks (or DOS
or VMS) you're not running a hard real time system. Shit happens.
The -rt kernel with fuill preemption actually is a hard real time system
(no one claims it is in the same league of reliability as QNX or
VXWorks, yet...) - it should be able to guarantee response times.
Of course the best RTOS in the world won't save you from apps that do
disk or GUI stuff in a non RT safe way, or from buggy ACPI
implementations that disappear the CPU out from under the OS for
milliseconds...
Lee