Hi, On 06/02/2016 09:42 AM, Chandran, Sugesh wrote: >>>> Do you also suggest to drop IP checksum flags? >>> > > >>> > > IP checksum offload is mostly useless. If application needs to look at >>> > > IP, it can do whole checksum in very few instructions, the whole >>> > > header is in the same cache line as src/dst so the HW offload is really >>> > > no >> > help. >>> > > > [Sugesh] The checksum offload can boost the tunneling performance in OVS. > I guess the IP checksum also important as L4. In some cases, UDP checksum is > zero and no need to validate it. But Ip checksum is present on all the > packets and that must be > validated all the time. At higher packet rate, the ip checksum offload can > offer slight > performance improvement. What do you think?? >
Agree, in some situations (and this is even more true with packet types / smartnics), the application could process without accessing the packet data if we keep the IP cksum flags. Regards, Olivier
