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https://issues.apache.org/jira/browse/TS-398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leif Hedstrom resolved TS-398.
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Resolution: Fixed
> Autoscaling threads vs Hyper Threading
> --------------------------------------
>
> Key: TS-398
> URL: https://issues.apache.org/jira/browse/TS-398
> Project: Traffic Server
> Issue Type: Improvement
> Components: Core
> Reporter: Leif Hedstrom
> Assignee: Leif Hedstrom
> Fix For: 3.1.0
>
>
> On my home box, Linux reports real cores and Hyper Thread cores the same way
> (this has always been the case). While doing some benchmarks, I noticed even
> a "multiplier" of 2.0x for the number of worker threads is too much for
> optimal performance. In fact, on my box, a setting of 1.0x, yielding 8 worker
> threads, yielded optimal performance.
> I think we might want to examine the CPU characteristics a little more
> careful, and not count Hyper Thread "cores" as real core, and adjust the
> number of worker threads only for real cores (or at least only give the HT
> cores "partial" credit).
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