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SubjectRe: Longstanding networking / SMP issue? (duplextest)

> > Yes IP is best-effort. But this argument cant explain why IP on linux
> > better if we disable SMP on linux...
> It has nothing to do with SMP. The lazy locking dropping packets can
> on UP kernels too in extreme cases. Also with preempt.

Well, I too noticed that binding NIC IRQS one one CPU

echo 1 > /proc/irq/18/smp_affinity

helps a lot in normal cases.

Some of us want SMP machine because application needs a lot of CPU, but we
also need to not drop frames to save the limited network bandwith.


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