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https://issues.apache.org/jira/browse/TS-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276422#comment-13276422
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John Plevyak commented on TS-1238:
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I think the problem is that the LRU cache doesn't account for its overhead,
while the CLFUS cache does which puts it at an unfair disadvantage in terms of
relative true memory used per byte allocated. The CLFUS cache is much better
behaved when the working set is larger than the RAM cache size and it supports
compression. I am going to commit this fix and leave CLFUS as the default and
file another bug to fix the accounting for ram in the LRU cache. I think this
will make the performance comparable in the best case and better in worse cases.
> RAM cache hit rate unexpectedly low
> -----------------------------------
>
> Key: TS-1238
> URL: https://issues.apache.org/jira/browse/TS-1238
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache
> Affects Versions: 3.1.3
> Reporter: John Plevyak
> Assignee: John Plevyak
> Fix For: 3.1.4
>
> Attachments: TS-1238-jp-1.patch
>
>
> The RAM cache is not getting the expected hit rate. Looks like there are a
> couple issues.
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