[e2e] A simple scenario. (Basically the reason for the sliding window thread ; -))

Joe Touch touch at ISI.EDU
Mon Jan 22 14:05:58 PST 2007

David Borman wrote:
>> This is a contradiction: clearly the splitter needs to keep up with
>> receiving small packets at rate or it can't sustain emitting the large
>> packets at full speed. If the splitter can do this, then the destination
>> can. The fact that it doesn't means this is (by definition) a patch to a
>> broken system.
> Ah, you are assuming that both the ethernet side and the 64K MTU side of
> the path operate equally efficiently using small packets.

source ---------------> splitter ----------------> dest
           1500byte                64K byte

You're claiming that the splitter is required to keep the 64Kbyte side
running at full rate. That means the 1500-byte side has to handle
packets roughly 40x faster. Otherwise, the 64K byte side is not running
at high-rate.

So here's what we have:
	- dest can handle 64K but not 1500
	- source must handle 1500 at high rate
	- splitter must receive 1500 at high rate

Now you're claiming that there's a link (source-splitter) that's
efficient enough for small packets. If that's the case, why would we
ever want the kind of link that's being used splitter-dest?

Again, this argues that something is seriously broken.


Joe Touch
Sr. Network Engineer, USAF TSAT Space Segment

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