|Thread Links||Date Links|
|Thread Prev||Thread Next||Thread Index||Date Prev||Date Next||Date Index|
While I share some of your frustration with the lack of
progress during this week’s HSSG meeting, and some of the individual
points in your presentation, I do not support it. I am in disagreement with your
Post-Debate Conclusions, and find their tone as not conducive to good
discussion of the best way to move forward within the HSSG. I am aware of the
passions generated during this week’s debate and understand why you wrote
your presentation, but wish that it had not been sent out. I am confident that
after your vacation travel in
Good discussion of how to move forward is critically dependant on acknowledging that 1) 100GE Broad Market Potential, and 2) 40GE Broad Market Potential have been established well above the threshold for 802.3 Five Criteria. Continued debate of this will only lead to delay in addressing the substantive issue of what is the best way to move forward in developing 100GE and 40GE standards. A possible framework for this discussion is outlined in “HSSG Next Steps Proposal” presentation that HSSG participants authorized as a post-deadline meeting submission.
An insight that has come out of the HSSG discussion of 100GE and 40GE rates during the past several months is that fundamental development cycles for new network equipment architectures and new server architectures appear to be different. A new data switch architecture development requires massive investment, which leads network equipment developers to want large jumps in data rate, like factors of 10x, to allow a return on that investment. An intermediate data rate causes an increase in the overall development investment, and a shortening of the useful life of network equipment which reduces the return on that investment.
Economics of server development appear to be different and more favorable to shorter development cycles, i.e. more frequent architecture changes. This drives the need for more granular jumps in data rate, like 4x. Ethernet has not done this historically, but that may be because protocols other then Ethernet were used to bridge the gap. Going forward, more granular Ethernet data rate steps may become the norm, rather then just a one time anomaly. This difference in development economics is also consistent with how often some end users replace servers versus networking equipment. It suggests that moving forward, network data rates may go from 10G to 100G to 1T, while server data rates go from 10G to 40G to 100G to 400G to 1T. This difference in data rate needs is not necessarily bad for either industry. More frequent server replacement may extend the useful life of network equipment (good for network equipment developers), and large jumps in network data rates assures availability of aggregation capacity to support multiple server cycles (good for server equipment developers.)
As we discuss how to best move forward with developing 100GE and 40GE standards, any approach needs to have the following two characteristics; 1) permits network equipment developers to have a single 100GE architecture, i.e. does not force them into developing a dual rate 100GE/40GE architecture, and 2) gives server equipment developers a 40GE server data rate. It may also need the recognition that some data rates are optimized for server interconnect and not intended for networking.
I look forward to a constructive discussion on how best to move both standards forward.
Subject: [HSSG] Soliciting Support for my Presentation
Date: Thu, 31 May 2007 05:25:12 -0000