[jira] Commented: (TS-314) RAM cache only caches the first part of the file

["John Plevyak (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864102#action_12864102 ] 

John Plevyak commented on TS-314:
---------------------------------

I would hazard a guess that this was because of the very small partitions and the way that objects were mapped to a partition and therefore ended up in a single smallish RAM cache.  I would imagine that if this was tested today with a large RAM cache and a small number of partitions that the problem would not exist.

> RAM cache only caches the first part of the file
> ------------------------------------------------
>
>                 Key: TS-314
>                 URL: https://issues.apache.org/jira/browse/TS-314
>             Project: Traffic Server
>          Issue Type: Improvement
>            Reporter: Miles Libbey
>            Priority: Minor
>
> (was yahoo bug 1562050)
> Original description
> by Bryan Call  2 years ago at 2007-10-26 08:53
> Leif was seeing a problem for large content, it was not all being served from RAM cache. Only the first 128K or
> something like that was being served.  We should verify that RAM cache is working even for the maximum size objects.
> 		
>  
> Comment 1
>  by Leif Hedstrom 2 years ago at 2007-10-26 09:29:10
> I think it was more like ~32MB served out of RAM cache. I don't have a good number, the only way I noticed this was by
> looking at disk I/O while fetching one request from cache (and I can see disk I/O kicks in after somewhere around 32MB
> of fetched data).
> 		

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