Reading the spec, it looks very much as though it's tuned for implementation in relatively simple, high-speed nodes. It doesn't look at all like it would work in conjunction with flow isolation, which is inherently a much more effective idea when feasible to deploy - which it should be at speeds up to at least 1Gbps.
However, I could see some use for GSP when combined with host isolation, at nodes aggregating a large number of subcriber hosts' traffic and thus requiring very high aggregate throughput. Host isolation doesn't require as many resources as full flow isolation, and is typically implemented anyway as part of per-subscriber provisioning. If tests are carried out, that might be the best scenario to start with. - Jonathan Morton
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