Wez Furlong
eecc1b8f1f
This commit continues in the theme of
18e510ebe2 to make us a bit more
discerning about how often the readyq maintainer is run.
In this case, we're adding an explicit delay in the maintainer itself
when there is a max_connection_rate defined for that particular site.
This will reduce overall cpu utilization in the case that the readyq
size suggests a larger number of connections than can be established
immediately, due to the max_connection_rate throttle.
As with the referenced earlier commit, this is an approximation; it may
cause more latency than is strictly required, but the consequences are
low because connection rates tend to have a short period, and the impact
is only a delay, not a suppresion of a wakeup. While the maintainer
task is delaying, any additional wakeups are queued and will effective
coalesce into a lower volume and rate of wakeups.
The throttling behavior is explicitly local-only, and doesn't use
the redis throttle backend, as the intent is to reduce the workload
rather than increase the workload.
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