2010/10/13 Jean-Michel Hautbois <[email protected]> > 2010/10/12 Stephen Hemminger <[email protected]> > >> > 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 ? >> >> You probably have NAPI and/or interrupt coalescing setting >> enabled on one or both of the devices. >> >> -- >> > > Hi Stephen, > > I have NAPI on my ethernet device, at least. > I will check for interrupt coalescing. > AFAIK, there is a skb_clone followed by a kfree in netif_receive_skb (the > frame coming from eth0 to br0). > There is a jitter in this call of "freeing memory". I am looking at the > path, in order to see why there is a clone. > > BR, > JM >
I have to tell I am working on a mpc52xx and am currently only interested in the eth->br path for the moment. JM
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