Re: [patch[ Simple Topology API

Martin J. Bligh (Martin.Bligh@us.ibm.com)
Tue, 16 Jul 2002 08:45:47 -0700



>> They can also go to no-glue 8-way:
>>
>> I/O -- A ------ B ------ E ------ G -- I/O
>> | | | |
>> | | | |
>> I/O -- C ------ D ------ F ------ H -- I/O
>
>
> I think the 8-way topology is a little more interesting than
> presented. But if not it does look like you can run into issues.
> The more I look at it there appears to be a strong dynamic balance
> in the architecture between having just enough bandwidth, and low
> enough latency not to become a bottleneck, and having a low hardware
> cost.

Whilst I don't have a definitive diagram, the "back of a napkin"
sketches we came up with at an OLS dinner looked like this:

I/O -- A ------ B ---- E ------ G -- I/O
| \/ |
| /\ |
I/O -- C ------ D ---- F ------ H -- I/O

(please excuse my poor artistic skills). That reduces the max
hops from 4 to 3 (if I haven't screwed something up).

M.

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