2010/10/12 Stephen Hemminger <shemmin...@linux-foundation.org> > > 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
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