On Tue, 24 Apr 2007, Jim Shankland wrote:
> Date: Tue, 24 Apr 2007 09:24:13 -0700 > From: Jim Shankland <[EMAIL PROTECTED]> > Subject: Re: from the academic side of the house > (1) Do the throughput figures count only the data payload (i.e., > anything above the TCP layer), or all the bits from the protocol > stack? If the latter, it seems a little unreasonable to credit > IPv6 with its own extra overhead -- though I'll concede that with > jumbo datagrams, that's not all that much. Data payload is counted as bytes transmitted and received by iperf. So application layer all the way. > (2) Getting this kind of throughput seems to depend on a fast > physical layer, plus some link-layer help (jumbo packets), plus > careful TCP tuning to deal with the large bandwidth-delay product. That last part has been researched for quite some time already, though mainly with "long" transatlantic layer 2 (Ethernet) paths mainly. > The IP layer sits between the second and third of those three items. > Is there something about IPv6 vs. IPv4 that specifically improves > perfomance on this kind of test? If so, what is it? Not that was specificly mentioned for this test I believe... Kind regards, JP Velders
