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Add tunable to allow interrupts on hyperthreaded cores
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Authored by gallatin on Nov 4 2019, 2:26 PM.
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Summary

This benefits workloads which are primarily interrupt driven by increasing the logical cores available for interrupt handling.

Note that there is a review open which will make the ULE scheduler schedule an ithread immediately on the local core. (https://reviews.freebsd.org/D17885). Running a Netflix workload with this patch applied leads to very uneven CPU use, as a substantial fraction of our workload is interrupt driven from the NIC ithread, and the logical cores are underutilized.

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rS FreeBSD src repository - subversion
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