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[Yasufumi Kinoshita <yasufumi.kinoshita@xxxxxxxxxxx>]

** Changed in: percona-xtradb
       Status: Fix Committed => Fix Released

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XtraDB has very irregular CPU-usage
https://bugs.launchpad.net/bugs/310656
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developers, which is the registrant for Percona-XtraDB.

Status in Percona XtraDB Storage Engine for MySQL: Fix Released

Bug description:
If you look at graph with CPU usage in this post
http://www.mysqlperformanceblog.com/2008/12/18/xtradb-in-cpu-bound-benchmark/

you see XtraDB has very irregular CPU-usage, while -std and -plugin has
more uniform (with dip at flushing time).

Probably it is related to adaptive_checkpointing, please investigate the issue.