[jira] [Updated] (TS-2992) EThread schedule fast_signal default

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

     [ https://issues.apache.org/jira/browse/TS-2992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leif Hedstrom updated TS-2992:
------------------------------
    Fix Version/s:     (was: 6.2.0)
                   7.0.0

> EThread schedule fast_signal default
> ------------------------------------
>
>                 Key: TS-2992
>                 URL: https://issues.apache.org/jira/browse/TS-2992
>             Project: Traffic Server
>          Issue Type: Task
>          Components: Core
>            Reporter: Otto van der Schaaf
>            Assignee: Alan M. Carroll
>              Labels: review
>             Fix For: 7.0.0
>
>         Attachments: ethread.patch
>
>
> For ats_speed, changing the fast_signal argument's default from false to true  in I_EThread::schedule helped improve latency when scheduling an event from an external thread pool (up to 5 ms per scheduled operation).
> This ticket at least documents this fact, and can perhaps serve as a discussion point. Perhaps it's worth it to make a setting out of this hard coded default.
> I'm not sure that setting fast_signal to true would be a good idea in general, as there probably is a cost to it. It was working fine for us though, and considering ats_speed's cause (leaning towards favoring user agents) I think it can sometimes be beneficial. 



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