[Libre-soc-bugs] [Bug 236] Atomics Standard writeup needed

[bugzilla-daemon at libre-soc.org]

https://bugs.libre-soc.org/show_bug.cgi?id=236

Luke Kenneth Casson Leighton <lkcl at lkcl.net> changed:

           What    |Removed                     |Added
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         Resolution|---                         |FIXED
             Status|IN_PROGRESS                 |RESOLVED

--- Comment #49 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
notes from the conversation on wednesday (not recorded)

Paul mentioned again that there is one person in IBM responsible for
the IBM POWER Architecture Fabric.  that is their sole job for probably
the past 20 years.  Atomic Memory operations are part of the Memory
Controller for which they are directly responsible, and their responsibility
includes ensuring Atomic Consistency when the number of Nodes in a system
exceeds several hundred thousand cores.

this is far beyond anything envisaged for "mere" commercial mass-volume
SoCs and anything that is and has been proposed and discussed at
considerable length including internally in IBM can and has been
rejected on the basis of it damaging the ability to ensure Atomic
Consistency and performance for massive Distributed Computing

therefore having discovered this, the proposal was far out of the
realm of possibility for completion, is being REDEFINED in terms of
the exploration achieved so far, is being CLOSED and a new proposal
is to be submitted later with a much greater budget.

jacob if you can briefly summarise the discoveries from the atomics
benchmarks specifically focussing on Power ISA that would help.

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