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Kanthi Subramanian edited comment on CASSANDRA-16436 at 12/5/21, 6:23 PM:
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Added PR - https://github.com/apache/cassandra/pull/1354
was (Author: subkanthi):
[~paulo] Does this have to be added in startupChecks.java, I can give it a shot
DEFAULT_TESTS
> Add startup check for large read_ahead_kb setting
> -------------------------------------------------
>
> Key: CASSANDRA-16436
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16436
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Startup and Shutdown
> Reporter: Paulo Motta
> Assignee: Kanthi Subramanian
> Priority: Normal
> Labels: AdventCalendar2021, lhf
>
> A well known production tuning recommendation is to dial back the
> {{read_ahead_kb}} Linux setting from the default of 4096 in most
> distributions as this can cause high IO usage and cache churn on
> read-intensive workloads.
> We should add a startup warning to detect when a high {{read_ahead_kb}} is
> used and recommend the user to dial back to a reasonable value, which varies
> according to the workload but a general guideline is to tune this to 8kb.
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