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Add tunable to allow interrupts on hyperthreaded cores

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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
This commit is contained in:
Andrew Gallatin 2019-11-04 19:30:19 +00:00
parent d6dbfed81e
commit bb7aaac379
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354338
1 changed files with 7 additions and 1 deletions
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8
sys/x86/x86/mp_x86.c
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@ -144,6 +144,11 @@ static int hyperthreading_allowed = 1;
SYSCTL_INT(_machdep, OID_AUTO, hyperthreading_allowed, CTLFLAG_RDTUN,
&hyperthreading_allowed, 0, "Use Intel HTT logical CPUs");
static int hyperthreading_intr_allowed = 0;
SYSCTL_INT(_machdep, OID_AUTO, hyperthreading_intr_allowed, CTLFLAG_RDTUN,
&hyperthreading_intr_allowed, 0,
"Allow interrupts on HTT logical CPUs");
static struct topo_node topo_root;
static int pkg_id_shift;
@ -1121,7 +1126,8 @@ set_interrupt_apic_ids(void)
continue;
/* Don't let hyperthreads service interrupts. */
if (cpu_info[apic_id].cpu_hyperthread)
if (cpu_info[apic_id].cpu_hyperthread &&
!hyperthreading_intr_allowed)
continue;
intr_add_cpu(i);