Add tunable to allow interrupts on hyperthreaded cores
Enabling interrupts on htt cores has benefits to workloads which are primarily interrupt driven by increasing the logical cores available for interrupt handling. The tunable is named machdep.hyperthreading_intr_allowed Reviewed by: kib, jhb Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D22233
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2020-12-20 02:59:44 +00:00
svn path=/head/; revision=354338
@ -144,6 +144,11 @@ static int hyperthreading_allowed = 1;
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SYSCTL_INT(_machdep, OID_AUTO, hyperthreading_allowed, CTLFLAG_RDTUN,
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&hyperthreading_allowed, 0, "Use Intel HTT logical CPUs");
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static int hyperthreading_intr_allowed = 0;
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SYSCTL_INT(_machdep, OID_AUTO, hyperthreading_intr_allowed, CTLFLAG_RDTUN,
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&hyperthreading_intr_allowed, 0,
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"Allow interrupts on HTT logical CPUs");
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static struct topo_node topo_root;
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static int pkg_id_shift;
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@ -1121,7 +1126,8 @@ set_interrupt_apic_ids(void)
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continue;
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/* Don't let hyperthreads service interrupts. */
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if (cpu_info[apic_id].cpu_hyperthread)
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if (cpu_info[apic_id].cpu_hyperthread &&
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!hyperthreading_intr_allowed)
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continue;
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intr_add_cpu(i);
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