Hi, On Mon, Sep 30, 2013 at 02:08:31PM -0700, David Daney wrote: > On 09/30/2013 12:56 PM, Aaro Koskinen wrote: > >What guarantees that CPU0 is around (or the smp_affinity is at its > >default value) by the time user executes modprobe? > > Nothing enforced by the kernel. Just don't take CPU0 off-line and > you should be good to go. > > There is a lot of room for improvement in the driver. > > Really this whole thing of starting NAPI on multiple CPUs for the > same input queue is not good. It leads to loss of packet ordering > when forwarding. I agree. I have also another patch which deletes this functionality altogether - should I post that one instead? In modern kernel you can use RPS to steer packets to different cores/softirqs threads, so in a way the driver currently duplicates some of the generic kernel functionality... A.
