Author: mav
Date: Sun Jan 28 18:18:03 2018
New Revision: 328514
URL: https://svnweb.freebsd.org/changeset/base/328514
Log:
Assume Always Running APIC Timer for AMD CPU families >= 0x12.
Fallback to HPET may cause locks congestions on many-core systems.
This change replicates Linux behavior.
MFC after: 1 month
Modified:
head/sys/x86/x86/local_apic.c
Modified: head/sys/x86/x86/local_apic.c
==============================================================================
--- head/sys/x86/x86/local_apic.c Sun Jan 28 16:10:40 2018
(r328513)
+++ head/sys/x86/x86/local_apic.c Sun Jan 28 18:18:03 2018
(r328514)
@@ -526,6 +526,9 @@ native_lapic_init(vm_paddr_t addr)
do_cpuid(0x06, regs);
if ((regs[0] & CPUTPM1_ARAT) != 0)
arat = 1;
+ } else if (cpu_vendor_id == CPU_VENDOR_AMD &&
+ CPUID_TO_FAMILY(cpu_id) >= 0x12) {
+ arat = 1;
}
bzero(&lapic_et, sizeof(lapic_et));
lapic_et.et_name = "LAPIC";
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