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https://issues.apache.org/jira/browse/TS-5090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15745974#comment-15745974
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Steve Malenfant commented on TS-5090:
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Confirming Leif's observation. In a VOD only test environment (HLS), we could
see CLFUS TCP_MEM_HIT going down to zero after ~20 hours. I've then changed the
ram_cache algorithm to LRU and use_seen_filter=1 and TCP_MEM_HIT were now
consistent.
Attaching a graph here as well. Red is CLFUS and Blue is LRU.
> Cache hit ratio deteriorating over time with CLFUS
> --------------------------------------------------
>
> Key: TS-5090
> URL: https://issues.apache.org/jira/browse/TS-5090
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache
> Reporter: Leif Hedstrom
> Attachments: RAM Cache.png
>
>
> We've observed poor cache hit ratio with the CLFUS, where it starts doing
> great, but over ~1 day, the cache hit ratio deteriorates. It's to the point
> where the LRU + seen-filter=1 is 2-3x better. In addition, the RAM cache hit
> ratio on the LRU stays consistent over time.
> At first, I thought it was only our particular use case, but it seems others
> have confirmed the same behavior.
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