Messages in this thread | | | Date | Sun, 03 Mar 2002 13:12:03 -0700 | From | Ben Greear <> | Subject | latency & real-time-ness. |
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I have been doing some tests with 2.4.19-pre2-ac2 with regard to network latency. When running a steady stream of 138byte UDP packets at 115 packets per second, I see about .1% of the packets take more than 5 miliseconds to go from user-space to user-space on a 1Ghz PIII machine.
At 50Mbps (bi directional), I see a much wider latency spread, with some packets taking up to 300ms or higher to get from A to B. The CPU load ranges from about 30% to 80% utilization at this speed...
I'm running the program at nice -18.
So, what kind of things can I do to decrease the latency?
Would the low-latency patch help me?
Are there any scheduling tricks I can use to tell the kernel that my program should get to run as soon as it wants to?
Thanks, Ben
-- Ben Greear <greearb@candelatech.com> <Ben_Greear AT excite.com> President of Candela Technologies Inc http://www.candelatech.com ScryMUD: http://scry.wanfear.com http://scry.wanfear.com/~greear
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