Persistent Bucket Notification performance

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Hi,

I'm really struggling with persistent bucket notifications running 17.2.3.
I can't get much more than 600 notifications a second but when changing to
async then i see higher rates using the following metric

sum(rate(ceph_rgw_pubsub_push_ok[$__rate_interval]))

I believe this is mainly down to being throttled by using 1 rgw rather than
all the rgw's the async method allows.

We would prefer to use persistent but can't get the throughput we need, any
suggestions would be much appreciated.

Thanks

Steven
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