The Speed of Time
Brendan Gregg
SEPTEMBER 25, 2021
A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. top(1) showed that only the Cassandra database was consuming CPU. I also shared setting the clocksource in my talks and in my 2015 [Linux tunables] post. What on Earth is Ubuntu doing that results in 30% higher CPU time!?
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