PPP/modem/serial port stalls under moderate CPU load

From: Anonymous (dargqaedrgj_at_mailinator.com)
Date: 07/09/05

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    Date: Sat, 09 Jul 2005 16:46:13 GMT

    Hi,

    I'm having a problem where my ppp connection stalls (meaning I don't have
    any packets coming or going) whenever my CPU load becomes moderately high.

    For example, if I'm running rsync I see packets coming and going in kppp
    like crazy, but if I run a game, tops reports my CPU load at 30% and the
    packets suddenly die. Quitting the game causes the packets to come back
    almost instantly (unless I waited to long...)

    I use a serial hardware modem (US Robotics 56K Ext Fax modem). I have crtcts
    enabled in ppp/options, and I tried the other flow control (crtdts) w/o any
    improvement. I also tried shutting off all compression (nobsdcomp,
    nodeflate, novj, etc..) thinking that would lessen dependence on the CPU.
    It didn't help.

    FYI I have AMD 64 3400+, slamd64-10.1 distro, kernel 2.6.11.10, pppd version
    2.4.2.

    Any ideas?

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