What's the hardware? We've seen interesting differences with chipsets
and motheboards. Consider that the pinheaded PC architecture has
to pass irqs via an emulated 8259A. sometimes a isa/pci interface,
a pci/processor bus interface and back again!
(of course, we are now working on a Moto MBX board that has an even
stupider design, so I guess its not fair to blame everything on Intel
and Gates).
Also, your terminology is confusing. Are you timing the start of an
interrupt handler or a periodic scheduled task?
The microseconds add up. I'd like to see some measurements on a BX
board.
On Wed, Jan 20, 1999 at 09:01:50AM -0800, frasc wrote:
>
> Hi folks,
>
> We are currently doing some experiment with RTL.
>
> Basically what we have been trying to measure so far is the task
> scheduler latency:
>
> Real Time Clock ---> IT wake_up ---> RT Task
> | |
> V V
> Toggle Pin2 Toggle Pin3
> parallel port parallel port
>
> Using a scope we measure an average 22 micro-seconds between IT and Task.
> [ best case 19.6 usecs, worst case 25 usecs ]
>
> Did you guys ever been able to get faster response time ?
>
> Thanks in advance for any advice!
>
> --
> Frédéric.R.R.Roussel
> [EMAIL PROTECTED]
>
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--
---------------------------------
Victor Yodaiken
Department of Computer Science
New Mexico Institute of Mining and Technology
Socorro NM 87801
Homepage http://www.cs.nmt.edu/~yodaiken
PowerPC Linux page http://linuxppc.cs.nmt.edu
Real-Time Page http://rtlinux.org
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