Hey Adam, > We did this exact testing a while back on Juniper 2nd and 3rd gen PFEs. > The results showed it doesn't matter a tiny bit whether you do 5-tuple hash > or use flow label. > So the bottom line is on modern NPUs it doesn't really matter.
Does PFE mean PE or Trio? What exactly did you test? I don't see way to disable L3+L4 keys and enable flow_label. Doing flow_label + sip + dip + sport + dport indeed would be pretty almost same cost as sip + dip + spot + dport, the cost difference will be very marginal. Doing flow_label or sip+sip+sport+dport the cost difference is non-marginal, if that actually is true for any specific implementation is separate matter. -- ++ytti
