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neon/pageserver
Christian Schwarz 35372a8f12 adjust VirtualFile operation latency histogram buckets (#12075)
The expected operating range for the production NVMe drives is
in the range of 50 to 250us.

The bucket boundaries before this PR were not well suited
to reason about the utilization / queuing / latency variability
of those devices.

# Performance

There was some concern about perf impact of having so many buckets,
considering the impl does a linear search on each observe().

I added a benchmark and measured on relevant machines.

In any way, the PR is 40 buckets, so, won't make a meaningful
difference on production machines (im4gn.2xlarge),
going from 30ns -> 35ns.
2025-05-30 13:22:53 +00:00
..
2025-05-27 12:06:51 +00:00