Date: Sun, 28 Jan 2018 18:18:03 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r328514 - head/sys/x86/x86 Message-ID: <201801281818.w0SII3fH056680@repo.freebsd.org>
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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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