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Posted to issues@trafficserver.apache.org by "Thomas Jackson (JIRA)" <ji...@apache.org> on 2016/05/26 22:14:12 UTC

[jira] [Resolved] (TS-4485) MultiCache sync causes significant stalls to various in-flight requests

     [ https://issues.apache.org/jira/browse/TS-4485?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thomas Jackson resolved TS-4485.
--------------------------------
    Resolution: Fixed

> MultiCache sync causes significant stalls to various in-flight requests
> -----------------------------------------------------------------------
>
>                 Key: TS-4485
>                 URL: https://issues.apache.org/jira/browse/TS-4485
>             Project: Traffic Server
>          Issue Type: Bug
>            Reporter: Thomas Jackson
>            Assignee: Thomas Jackson
>
> MultiCache's sync to disk currently schedules the syncer task on the ET_NET thread that is holding the lock for the partition of hostdb. This is a bit unfortunate, as the syncer will actually call `msync` which means its calling a blocking write to disk. I'm seeing this cause some fairly large latency spikes (~100-300ms) on occasion-- even though the disk IO is completely available (since the ET_NET thread gets stalled the entire time, IO that needs to happen is also stalled).



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