Hi Pekka (et al),
> 102MB/s with 1MB AceNIC's with jumbo frames using < 5% CPU is what I
> currently get ;)
I believe we have to take jumbo frames off the table for STP. As I
understand it (somebody please correct me if I'm wrong!), 802 has
killed jumbo frames twice, in recent history, once for 1 GigE and once
for 10 GigE. That basically means that even though some vendors
support it (Alteon and Extreme, that I know of), it's not going to
happen.
I have heard this on from two different sources separated by years,
most recently a few weeks ago from somebody at 3Com who should know.
He did say that he thought that Alteon was trying to get an IETF
standardization of jumbo frames, but that seems (to him and me)
unlikely to go anywhere, because it's not the right place for it to be
decided.
I guess you could say that running jumbo ethernet is like running
Myranet or something---an isolated, nonstandard networking
technology. In other words, SURE, some people do it, but it's
considered fringe rather than commodity.
I think the upshot is that if STPers focus on jumbo frame performance,
we're going to look like we're completely out of touch with the real
world.
So (I'm almost afraid to ask) what's the performance for 1500 byte MTU
(1K STUs)? The good news is that, you'll probably be able to say < 2%
CPU, and the bad news is that the data rate is going to be, well,
lower too.
Steph
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