I've been running 1300 Hz on P-133 and PMMX-233 for
billions of cycles with no observed deviation from the
programmed frequency. On the P-133, my RT-kernel code
takes about 40% of my CPU's bandwidth but it seems to be
less than 10% on the PMMX-233. What do you have your
thread doing?
Norm
----- Original Message -----
From: David Hamilton <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, October 15, 2001 5:44 AM
Subject: [rtl] Maximum cycling frequency of 200Hz?
> I'm running RTLinux 3.1 on a PC with an AMD K6 500Mhz
processor (RedHat7.1).
>
> I seem to be only able to run a real-time loop at a
maximum frequency of
> 200Hz.
> Trying to set a lower period in pthread_make_period... or
a shorter sleep in
> nanosleep has no effect beyond 200Hz (5msec)!
>
> I've read in other emails about the #define HZ 100 in the
linux param.h
> file, but assumed that only effected context switching
within the user
> space.
> I've also read about people reaching rates in excess of
1KHz (I'm looking
> for 1KHz).
>
> Can anyone tell me what I have to do to get these higher
frequencies, or is
> it a limitation of my hardware.
> David
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