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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ed5316d445
Ensure that no SMI interrupts occur between the read of the HPET & TSC in the clock calibration loop. I noticed that a 2.66GHz system incorrectly detected the processor clock speed about 1/7 of the time: time.c: Detected 2660.005 MHz processor. (most of the time) time.c: Detected 2988.203 MHz processor. (sometime) The problem is caused by an SMI interrupt occuring in hpet_calibrate_tsc() between the read of the HPET & TSC. Prior to switching the BIOS into ACPI mode, it appears that every 27msec an SMI interrupt occurs. The SMI interrupt takes 4.8 msec to process. Note: On my test system, TICK_MIN had to be >380. I picked 5000 to minimize risk of having a value that is too small for other platforms. Signed-off-by: Jack Steiner <steiner@sgi.com> Signed-off-by: Andi Kleen <ak@suse.de> arch/x86_64/kernel/time.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) |
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| .. | ||
| acpi | ||
| cpufreq | ||
| aperture.c | ||
| apic.c | ||
| asm-offsets.c | ||
| audit.c | ||
| crash_dump.c | ||
| crash.c | ||
| e820.c | ||
| early_printk.c | ||
| early-quirks.c | ||
| entry.S | ||
| functionlist | ||
| genapic_cluster.c | ||
| genapic_flat.c | ||
| genapic.c | ||
| head64.c | ||
| head.S | ||
| i387.c | ||
| i8259.c | ||
| init_task.c | ||
| io_apic.c | ||
| ioport.c | ||
| irq.c | ||
| k8.c | ||
| kprobes.c | ||
| ldt.c | ||
| machine_kexec.c | ||
| Makefile | ||
| mce_amd.c | ||
| mce_intel.c | ||
| mce.c | ||
| module.c | ||
| mpparse.c | ||
| nmi.c | ||
| pci-calgary.c | ||
| pci-dma.c | ||
| pci-gart.c | ||
| pci-nommu.c | ||
| pci-swiotlb.c | ||
| pmtimer.c | ||
| process.c | ||
| ptrace.c | ||
| reboot.c | ||
| relocate_kernel.S | ||
| setup64.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| smpboot.c | ||
| stacktrace.c | ||
| suspend_asm.S | ||
| suspend.c | ||
| sys_x86_64.c | ||
| syscall.c | ||
| tce.c | ||
| time.c | ||
| trampoline.S | ||
| traps.c | ||
| vmlinux.lds.S | ||
| vsmp.c | ||
| vsyscall.c | ||
| x8664_ksyms.c | ||