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    SubjectRe: 2.0.30 serial.c, ppp.c and pppd-2.2 questions

    On 22-Jul-97 Theodore Y. Ts'o wrote:
    >Rob, what else do you have on your system? Although I haven't done the
    >test in a while, the serial driver was originally written to be able to
    >support 115kbaud on a 386/40. (Granted this was a kermit transfers, not
    >PPP; but it was a looped back 115kbaud transfer where the transmitting
    >and receiving ports were on the same CPU, doubling the work.)
    >The fact that your 486/66 isn't keeping up makes me wonder what other
    >sources of interrupts you are having on your system.

    I have a caching IDE controller (UltraStor) running 'hdparm -u 1',
    an NE2000 clone NIC, a MS busmouse, and 3 other serial ports (of
    which only one is occasionally in use at 38400bps). The buffer
    overruns occur when transfering across the net via a masqueraded
    connection or NFS, or when writing directly to the local HD.

    None of the devices seem to generate an extrordinary number of
    interrupts (guaged by viewing /proc/interrupts).


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