10 ms overhead when calling Thread.sleep on Linux

Hi,

I have been working on a traffic shaping simulation that requires me to send packets on a ms basis. When I call Thread.sleep(11) on Linux 2.4, I get a constant return around 30 ms. I tried to bypass the Thread.sleep function and called directly the select() function under linux with a timeout of 11 ms then I get a constant return around 20 ms. Then if I create a test.c program that loop 100 times calling the select(11), I get a very accurate rate around 10-11 ms. Anyone knows where that 10 ms overhead comes from? I tried executing the java program with Thread.sleep and the -XX:ForceTimeHighResolution but it doesn;t seem to change anything ! Any info would be very welcome ! Thanks

[705 byte] By [EmmaDauphina] at [2007-11-26 17:32:28]