[jira] [Commented] (TS-3753) High CPU iowait with null-transform on a content from the cache.

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-3753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14636544#comment-14636544 ] 

Leif Hedstrom commented on TS-3753:
-----------------------------------

Pavel, I wonder if this is a "dupe" of TS-2496 ? If so, would you mind moving your comments and patches / analysis to that one?

Thanks!

> High CPU iowait with null-transform on a content from the cache.
> ----------------------------------------------------------------
>
>                 Key: TS-3753
>                 URL: https://issues.apache.org/jira/browse/TS-3753
>             Project: Traffic Server
>          Issue Type: Bug
>          Components: Plugins, TS API
>    Affects Versions: 5.3.0
>            Reporter: Pavel Vazharov
>             Fix For: 6.1.0
>
>         Attachments: null-transform-cache.patch, usi.png
>
>
> Hi,
> I'm trying to calculate some stats doing null-transform on a content served from the cache. However, I observed high CPU iowait when doing this. I isolated the issue to be related to the case when we do transformation on a content served from the cache. Please, see the attached few lines patch which when applied to the null-transform plugin causes high CPU iowait. Note also that when I tried the original null-transform plugin I didn't observe such increased CPU iowait. Please, see also the attached picture where you can see the increased  CPU iowait (between 15:30 and 16:30 in red) when I started the test with null-transform from cache.



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