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https://issues.apache.org/jira/browse/CASSANDRA-1968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12984611#action_12984611
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Peter Schuller commented on CASSANDRA-1968:
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Anyone got a good feel for how much pause times will be affected after 
long-time use? WIth a fixed new size, I'm a bit paranoid about pause times 
creeping up as young gen becomes more fragmented etc. However I'm not up enough 
on how CMS old-gen is managed to know whether this is an expected result.

> Increase JVM young generation size
> ----------------------------------
>
>                 Key: CASSANDRA-1968
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1968
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 0.7.0
>            Reporter: Brandon Williams
>            Assignee: Brandon Williams
>             Fix For: 0.7.1
>
>         Attachments: 1968.txt, 1968_v2.txt
>
>   Original Estimate: 4h
>  Remaining Estimate: 4h
>
> Increasing the young generation size has a profound effect on performance and 
> cpu utilization.  We should set it explicitly.

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