On Tue, 2012-04-10 at 21:10 -0300, Henrique de Moraes Holschuh wrote: > On Tue, 10 Apr 2012, Martin T wrote: > > It's a well known fact that even most(with exceptions like ASR1K) of > > the high-end Cisco or Juniper routers handle ICMP traffic in routing > > engines not in ASIC's which means that they share the CPU time with > > other processes. How prioritized is ICMP handling in modern Linux 2.6 > > and newer kernels? Is it possible to prioritize ICMP handling in > > kernel? > > AFAIK, it has the same priority of every other packet that makes it to the > IP stack. > > Easy depriorizing is possible by outright dropping incoming ICMP packets > in the iptables layer, before it is processed by the IP stack. > > I suppose advanced NICs might be able to use receiver-side flow-steering to > priorize or depriorize ICMP packets before delivering them to the driver, or > you could steer them all to a particular core. > > I fear you will probably need to ask this question in the netdev ML if > you want a better answer. > Setting up a qdisc via the tc utility would be a more controlled way than simply drop or not drop. Alas, it is not one of the simpler things to do in Linux - John
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