> beyond "normal HVAC" and stock xtals on the motherboard. This is
> after we've done the fast interrupt hack. Without it, the other
> system activity was causing enough interrupt latncy variance that we
> would see more like +- 80us with outliers way off in the weeds
> (+- just under 10ms!).
Warner, this sounds related to a problem we are having...
a student of mine is seeing sporadic but relatively large (~50-100us) variations
in the period of clock interrupts (int0 calls to the assembly
routine). This is in the assembler part of the interrupt
service routine, so the only reason I can see for these
variations is that there are some significantly large sections
of code (this is a 750 MHz box) which run with interrupts
disable on the CPU.
Is this the case ? And if so, what is the "fast interrupt hack" that you
are mentioning and how would it improve things ?
thanks
luigi
----------------------------------+-----------------------------------------
Luigi RIZZO, [EMAIL PROTECTED] . ACIRI/ICSI (on leave from Univ. di Pisa)
http://www.iet.unipi.it/~luigi/ . 1947 Center St, Berkeley CA 94704
Phone: (510) 666 2927
----------------------------------+-----------------------------------------
To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-hackers" in the body of the message
