Author: jhb
Date: Fri Mar 6 20:34:28 2015
New Revision: 279699
URL: https://svnweb.freebsd.org/changeset/base/279699
Log:
Only schedule interrupts on a single hyperthread of a modern Intel CPU core
by default. Previously we used a single hyperthread on Pentium4-era
cores but used both hyperthreads on more recent CPUs.
MFC after: 2 weeks
Modified:
head/sys/amd64/amd64/mp_machdep.c
head/sys/i386/i386/mp_machdep.c
Modified: head/sys/amd64/amd64/mp_machdep.c
==============================================================================
--- head/sys/amd64/amd64/mp_machdep.c Fri Mar 6 16:43:54 2015
(r279698)
+++ head/sys/amd64/amd64/mp_machdep.c Fri Mar 6 20:34:28 2015
(r279699)
@@ -828,8 +828,8 @@ set_interrupt_apic_ids(void)
continue;
/* Don't let hyperthreads service interrupts. */
- if (hyperthreading_cpus > 1 &&
- apic_id % hyperthreading_cpus != 0)
+ if (cpu_logical > 1 &&
+ apic_id % cpu_logical != 0)
continue;
intr_add_cpu(i);
Modified: head/sys/i386/i386/mp_machdep.c
==============================================================================
--- head/sys/i386/i386/mp_machdep.c Fri Mar 6 16:43:54 2015
(r279698)
+++ head/sys/i386/i386/mp_machdep.c Fri Mar 6 20:34:28 2015
(r279699)
@@ -842,8 +842,8 @@ set_interrupt_apic_ids(void)
continue;
/* Don't let hyperthreads service interrupts. */
- if (hyperthreading_cpus > 1 &&
- apic_id % hyperthreading_cpus != 0)
+ if (cpu_logical > 1 &&
+ apic_id % cpu_logical != 0)
continue;
intr_add_cpu(i);
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