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A comment on Instrumentation: The First Four Things You Measure. Parent comment

Re:Instrumentation: The First Four Things You Measure by bbrazil on Thursday January 26, 2017 @08:01PM (#13496882)
By default you can only get that per-kernel from /proc/net/netsnmp. BPF may allow something more granular.

The other way of approaching it is to look for the additional latency it causes, which you can spot on a per-service basis.

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Re:Instrumentation: The First Four Things You Measure by saravana87 on Friday January 27, 2017 @01:53AM (#13498218)
Additional latency could be an indicator, but there's no guarantee that it is because of retransmissions ?
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Re:Instrumentation: The First Four Things You Measure by bbrazil on Friday January 27, 2017 @04:35AM (#13498724)
If you look at your latency histogram and are seeing a bump at around 200ms above normal (which was the default minimum wait time a few years back anyway), it's probably retransmits.
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Re:Instrumentation: The First Four Things You Measure by saravana87 on Friday January 27, 2017 @01:12PM (#13501436)
Got it.
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