Hi there ! I am facing a jitter issue that I will try to explain : I have the following configuration :
(A) eth0 <--> br0 <--> eth1 (B) I have a small and custom kernel (I removed netfilter, for instance) and I am measuring the time between A and B (using hardware taps, etc.). My bandwidth is quite small (each packet is about 200 bytes and there is a delay of 10ms between each packet). I am measuring both the latency and the jitter (max_latency - min_latency) and this one is quite large. I added ftrace option, and after some (long) investigations, I am currently limiting my study to the bridge part. When I trace only br_handle_frame and br_forward_finish and do my test on 6500 frames I have : - average latency of 39µs - minimum latency of 34 µs - maximum latency of 81µs Thus, my jitter is 47µs. This may seem low, but this is about two to three times what I expect and I cannot see why a bridge which is only forwarding a frame would have jitter ? If you have any idea, everything is interesting for me. I thought maybe to skb_clone ? Best Regards, JM
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