On Sun, 1 Apr 2018 20:47:28 -0400 Md. Islam" <misl...@kent.edu> wrote:
> [...] More specifically, header parsing and fib > lookup only takes around 82 ns. This shows that this could be used to > implement linerate packet forwarding in kernel. I cannot resist correcting you... You didn't specify the link speed, but assuming 10Gbit/s, then the linerate is 14.88Mpps, which is 67.2 ns between arriving packets. Thus, if the lookup cost is 82 ns, thus you cannot claim linerate performance with these numbers. Details: This is calculated based on the the minimum Ethernet frame size 84-bytes, see https://en.wikipedia.org/wiki/Ethernet_frame for why this is the minimum size. 10*10^9/(84*8) = 14,880,952 pps 1/last*10^9 = 67.2 ns -- Best regards, Jesper Dangaard Brouer MSc.CS, Principal Kernel Engineer at Red Hat LinkedIn: http://www.linkedin.com/in/brouer
