RE: [uCsimm] Hard Real time Linux

From: Jeff Bauknecht (
Date: Wed Feb 23 2000 - 17:39:16 EST

The problem is context switch time. With Hard real time systems it is <10
microseconds. I am trying to find out context switch times in Linux also.
There will be several processors and DSP's many pegs many holes.
    -----Original Message-----
    From: []On
Behalf Of Tom Walsh
    Sent: Wednesday, February 23, 2000 2:58 PM
    Subject: Re: [uCsimm] Hard Real time Linux

    Jeff Bauknecht wrote:
        My company has been looking at different operating systems for our
        product. We are probably going to have a PowerPC processor (860).
        product is going to be a PBX. The real time extensions to Linux are
        better. We have one problem that is keeping Linux from being our
        That is a conference bridge. A conference bridge takes several
        sources sums them together, averages them and sends them back out.
This is
        processor intensive. It has to be hard real time. LynxOS has put
        Bluecat, but it is only soft real time. This might be to encourage
        to use their LynxOS for the hard real time applications. Is anyone
        of a solution for this? I.E Hard real time extensions for Linux?
        Thank You

        Jeff Bauknecht
        PremiseNET, Inc.

        I have been pushing Linux here at work and need help.

        Not all solutions have to be a 'single chip' one, nor can they be,
it sounds to me that your solution is that of a multiple processor one: a
processor that passes data around on the IP network and the other processor
to do the heavy work of summing the voice data.

        Round pegs + square holes type of problem, like trying to do DSP
with a PIC controller.



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Tom Walsh - WN3L - Embedded Systems Consultant - tom over_at mytoys(.)com
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"Windows? No thanks, I have work to do..."

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