neutron/releasenotes/notes/modify_api_rpc_worker_defau...

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upgrade:
- The number of api and rpc workers may change on upgrade.
It is strongly recommended that all deployers set these
values in their neutron configurations, rather than
using the defaults.
fixes:
- Neutron API workers default to the number of CPU cores.
This can lead to high cpu/low memory boxes getting into
trouble. The defaults have been tweaked to attempt to
put an upper bound on the default of either the number
of cores, or half of system memory, whichever is lower.
In addition, the default number of RPC workers has been
changed from a value of ``1``, to a value of half the
number of API workers.