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Old 07-09-2005, 01:27 AM   #1
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PPP stalls under moderate CPU load


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, pppd version 2.4.2.

Any ideas?
Old 07-09-2005, 02:31 PM   #2
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Old 07-09-2005, 02:46 PM   #3
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Sorry to post so much..

I played with setserial & modem strings, and nothing helped.

However, I now know that the problem is not CPU related.
My CPU usage can be 99% and ppp will work fine.

The real problem is that any game that uses /dev/input/js0 (my Gravis Gamepad Pro connected to my SB Live! Value game port) causes the network / ppp / modem / serial / something to stop working, and all network traffic ceases. If I close the game, or If I start the game without using the joystick, everything works fine. Both snes9x and fceu (NES emulator) demonstrate this.


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