Messages in this thread | | | Date | Mon, 15 Jul 2002 22:50:23 +0300 (EEST) | From | Jukka Honkela <> | Subject | Re: [patch[ Simple Topology API |
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Chris Friesen wrote:
>> Beyond 8-way, you need glue logic (hypertransport switches?) and >> latency seems bound to become an issue.
>Nope. Just extend the ladder. Each cpu talks to three other entities, >either cpu or I/O. Can be extended arbitrarily until latencies are too >high.
You seem to be missing one critical piece from the OLS talk. The HT protocol (or something related) can't handle more than 8 CPU's in a single configuration. You need to have some kind of bridge to connect more than 8CPU's together, although systems with more than 8 CPU's have not been discussed officially anywhere, afaik.
8 CPU's and less belongs to the SUMO category (Sufficiently Uniform Memory Organization, apparently new AMD terminology) whereas 9 CPU's and more is likely to be NUMA.
-- Jukka Honkela
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