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https://issues.apache.org/jira/browse/TS-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266934#comment-13266934
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John Plevyak commented on TS-1238:
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I agree that such a configuration would be more convenient. Before this patch
it was 1 with LRU and 3 with CLFUS. With this patch you can do 1 or 2 with
LRU (where 2 was the default in 2.0 and 1 was the default in 3.0) and 2 or 3
with CLFUS (where in 3.0 the default was 3). The higher number occurs when the
seen_filter is ON. What would be interesting to see is 1) if LRU is better
with 1 or 2 and 2) if CLFUS with 2 is better (or worse) than LRU with 2. This
bug is basically that LRU @ 1 > CLFUS @ 3 for some workloads. Ultimately,
easier configuration and some guidelines or better yet, auto-tuning would be
the objective.
> 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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