Author: gallatin Date: Mon Nov 4 19:30:19 2019 New Revision: 354338 URL: https://svnweb.freebsd.org/changeset/base/354338
Log: 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 Modified: head/sys/x86/x86/mp_x86.c Modified: head/sys/x86/x86/mp_x86.c ============================================================================== --- head/sys/x86/x86/mp_x86.c Mon Nov 4 18:34:29 2019 (r354337) +++ head/sys/x86/x86/mp_x86.c Mon Nov 4 19:30:19 2019 (r354338) @@ -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); _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
