LSN age factor tuning for adaptive flushing in 5.6

Registered by Laurynas Biveinis on 2013-10-02

With the tuned page cleaner heuristics [1], adaptive flushing becomes too aggressive and maintains a consistently lower checkpoint age than a similarly-configured stock server. This results in a performance loss due to reduced write combining.

One way to address this is to reduce LSN age factor at low LSN ages and increase it at high LSN ages with a different option.

Introduce new system variable innodb_cleaner_lsn_age_factor=LEGACY|HIGH_CHECKPOINT, default HIGH_CHECKPOINT, to control the formula choice.

[1] https://blueprints.launchpad.net/percona-server/+spec/cleaner-tuning-5.6

Blueprint information

Status:
Complete
Approver:
None
Priority:
High
Drafter:
Laurynas Biveinis
Direction:
Approved
Assignee:
Laurynas Biveinis
Definition:
Approved
Series goal:
Accepted for 5.6
Implementation:
Implemented
Milestone target:
milestone icon 5.6.13-61.0
Started by
Laurynas Biveinis on 2013-10-02
Completed by
Laurynas Biveinis on 2013-10-03

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