&gt; [I]f you configure [jumbo] frames on your uplink you are going to kill your network stack...<p>I can&#x27;t agree with that statement. If upstream devices support larger than 1500 byte MTU, <i>OR</i> PTMU works correctly, then you are absolutely <i>not</i> going to &quot;kill your network stack&quot;. At worst, (in the PMTU discovery phase) you&#x27;ll see poor performance for a few moments while the MTU for the path is worked out, and then nothing but smooth sailing from then on.<p>&gt; The point being is that for transferring data especially when responsiveness is important if not paramount utilizing the maximum potential frame size you can push without fragmentation would generally yield a poorer result in real world applications.<p>I&#x27;m not sure what you&#x27;re saying here. Are you saying:<p>&quot;If you configure your networking equipment to <i>always</i> wait to fill up a full L2 frame before sending it off, you&#x27;ll harm perf on latency-sensitive applications.&quot;?<p>If you&#x27;re not, would you be so kind as to rephrase your statement? I may be particularly dense today. :)<p>However, if you are, then that statement is <i>pretty</i> obvious. I expect that few people configure their networks to do that. However, I don&#x27;t see what that has to do with the link&#x27;s MTU. Just because you have a 9k+ MTU, doesn&#x27;t mean that you <i>have</i> to transmit 9k of data at a time. :)