Hi there! I am working a lot with VoIP in my company, so I thought to use linux bridge functionality together with tc to emulate delay, jitter, packet loss, duplication, reordering etc. for testing purposes in our lab against our VoIP products. I just recognized, that a basic bridge just with it's minumum configuration of 2 network interfaces creates latency of approx. 5ms on very low traffic. This seems to be independent on CPU speed. I tried on 2 GHz PC while having just 64kBit traffic with packet size of about 300bytes. I am using Knoppix 3.82 which is actually a debian Live-CD Linux, Kernel 2.6.11. For some reason they put iproute2 041019 on this distro, which is intended to be used for kernel 2.6.9. I am aware of remastering the CD, but have to check if it is possible to recompile the kernel for the remaster. back to my question: where does this latency come from? "top" shows almost no load while the bridge is handling traffic, so how come? is there some timer-granularity which can be set in the kernel, is the latency normal, or what could cause it else? Thank you very much in advance! /Christian _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
