> Yes IP is best-effort. But this argument cant explain why IP on linux works > better if we disable SMP on linux... It has nothing to do with SMP. The lazy locking dropping packets can happen on UP kernels too in extreme cases. Also with preempt. -Andi - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html