Dear all,

Platform => Linux 2.4.32 with RTAI
Development in User Space

I am developing the UDP Streamer, which sends the UDP packets at particular time, the target transport rate is 20Mbits/s and the time different between each UDP packet is about 500 microseconds. The transmission time must be very precisely, otherwise the buffer of receiver will be under-flow or over-flow.

In my program, nanosleep function is used to control the time, and I observed the kernel sometimes schedules to do other lower priority tasks. It makes my program sometimes occurs LONG DELAY, about 20 ~ 60 milliseconds, and my program can't use 100% resource of whole Linux system.

I was trying different methods, for example, low-latency patch, preemption patch and hrt patch, but the problem still doesn't been solved.

Any idea can share with me?

Thank you very much