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    SubjectRe: Linux Serial Performance
    * Paul G. Allen (pgallen@gmail.com) wrote:
    > Well, as far as I know. Same code on both systems. The embedded device
    > operates at 115200, 8N1, no flow control. It uses RPC/SLIP protocol
    > for commands and data. They talk to each other, but the Linux system
    > just takes forever to send the data.

    What does the RPC/SLIP - the app or the Kernel?

    If you have no flow control is it possible that someone is dropping a byte
    somewhere any recovering?

    If your device is set at the right speed (check with stty -a < /dev/ttyS??? )
    then what speed does :

    dd if=/dev/zero of=/dev/ttyS??? bs=1 count=10000

    show, for my line set at 9k6 (on ttyS0) it's showing 1.0kB/s which
    seems about right.

    What's the serial card - is it an onboard card or a PCI plug in,
    I've seen problems on Linux a few times where the device driver
    has the speed of some plugin cards out by a factor of 8.

    Dave
    --
    -----Open up your eyes, open up your mind, open up your code -------
    / Dr. David Alan Gilbert | Running GNU/Linux on Alpha,68K| Happy \
    \ gro.gilbert @ treblig.org | MIPS,x86,ARM,SPARC,PPC & HPPA | In Hex /
    \ _________________________|_____ http://www.treblig.org |_______/


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