[SOLVED] XMP overclock shows in UEFI but not in Arch Linux

dockland · 2017-07-31 20:03:21

I really am bad at hardware and overclocking but have tweaked my UEFI on ASUS Deluxe II board enabling XMP and set the clock speed on all cores to 42, but dmidecode shows below, all stock speeds.
It says i have a Xeon family processor as well, but it's a i7 6900K (that is stated correctly under "version" though)

Does Arch Linux "ignore" my UEFI settings? Haven't tried in Gentoo though, but there i use a CPU frequency scaler and have disabled intel p_state in my kernel line.

Does anyone know if i have to manually overclock via the UEFI, changing voltages to be able to adapt my some what overclocked CPU? Or is is simply Intel P_State that is deciding things for my OS?

Handle 0x0073, DMI type 4, 42 bytes
Processor Information
        Socket Designation: SOCKET 2011
        Type: Central Processor
        Family: Xeon
        Manufacturer: Intel
        ID: F1 06 04 00 FF FB EB BF
        Signature: Type 0, Family 6, Model 79, Stepping 1
        Flags:
                FPU (Floating-point unit on-chip)
                VME (Virtual mode extension)
                DE (Debugging extension)
                PSE (Page size extension)
                TSC (Time stamp counter)
                MSR (Model specific registers)
                PAE (Physical address extension)
                MCE (Machine check exception)
                CX8 (CMPXCHG8 instruction supported)
                APIC (On-chip APIC hardware supported)
                SEP (Fast system call)
                MTRR (Memory type range registers)
                PGE (Page global enable)
                MCA (Machine check architecture)
                CMOV (Conditional move instruction supported)
                PAT (Page attribute table)
                PSE-36 (36-bit page size extension)
                CLFSH (CLFLUSH instruction supported)
                DS (Debug store)
                ACPI (ACPI supported)
                MMX (MMX technology supported)
                FXSR (FXSAVE and FXSTOR instructions supported)
                SSE (Streaming SIMD extensions)
                SSE2 (Streaming SIMD extensions 2)
                SS (Self-snoop)
                HTT (Multi-threading)
                TM (Thermal monitor supported)
                PBE (Pending break enabled)
        Version: Intel(R) Core(TM) i7-6900K CPU @ 3.20GHz
        Voltage: 1.2 V
        External Clock: 100 MHz
        Max Speed: 4000 MHz
        Current Speed: 3200 MHz
        Status: Populated, Enabled
        Upgrade: Socket LGA2011-3
        L1 Cache Handle: 0x0070
        L2 Cache Handle: 0x0071
        L3 Cache Handle: 0x0072
        Serial Number: Not Specified
        Asset Tag: Not Specified
        Part Number: Not Specified
        Core Count: 8
        Core Enabled: 8
        Thread Count: 16
        Characteristics:
                64-bit capable
                Multi-Core
                Hardware Thread
                Execute Protection
                Enhanced Virtualization
                Power/Performance Control

And addind lscpu as well

[root@dome arch]# lscpu
Architecture:        x86_64
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Little Endian
CPU(s):              16
On-line CPU(s) list: 0-15
Thread(s) per core:  2
Core(s) per socket:  8
Socket(s):           1
NUMA node(s):        1
Vendor ID:           GenuineIntel
CPU family:          6
Model:               79
Model name:          Intel(R) Core(TM) i7-6900K CPU @ 3.20GHz
Stepping:            1
CPU MHz:             1200.585
CPU max MHz:         4000.0000
CPU min MHz:         1200.0000
BogoMIPS:            6402.76
Virtualization:      VT-x
L1d cache:           32K
L1i cache:           32K
L2 cache:            256K
L3 cache:            20480K
NUMA node0 CPU(s):   0-15
Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 intel_ppin intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm rdt_a rdseed adx smap xsaveopt cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts

Last edited by dockland (2017-08-01 20:26:22)

V1del · 2017-08-01 11:27:38

Works here:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0-7
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             1
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 94
Model name:            Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz
Stepping:              3
CPU MHz:               4589.843
CPU max MHz:           4600.0000
CPU min MHz:           800.0000
BogoMIPS:              8019.00
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node0 CPU(s):     0-7
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp

Are you sure you are applying your changes to the correct setting? FWIW XMP is for memory and shouldn't have a bearing on your CPU clock, maybe you just adjusted only a memory OC knob? Any non default kernel parameters? And as I notice that your stepping is on 1, you might additionally want to make sure that your Microcode updates are properly applied

Last edited by V1del (2017-08-01 11:39:34)

dockland · 2017-08-01 11:32:00

Thanks, True, that is what iv'e done. Only memory overclocking (basically just enabling XMP and changed my CPU speed to 4.2.
I'll try to tweak this manually with voltage and multiplier manually and check whether that solves things.

Checked microcode aswell

[arch@dome ~]$ dmesg | grep microcode
[    0.000000] microcode: microcode updated early to revision 0xb000021, date = 2017-03-01
[   10.052044] microcode: sig=0x406f1, pf=0x4, revision=0xb000021
[   10.052180] microcode: Microcode Update Driver: v2.2.

and /boot/loader/entries/arch.conf

title   Arch linux
linux   /vmlinuz-linux
initrd  /intel-ucode.img
initrd  /initramfs-linux.img
options root=PARTUUID=d0f51ed7-7848-4d1b-a52d-54a06800a469 rw quiet vga=current nowatchdog

But I'll give it a go and report back accordingly

E2: It's the Intel p_state that brings my stock speeds so to speek.
Disabling it on kernel line, installing cpupower and setting it to "Performance" governor crams things up to ~4.0-4.2GHz

Don't really need the OC in Arch Linux, so i'm reverting back to defaults.
In Gentoo Linux though, i'd like to have the extra horsepower when emerging (It really makes a huge difference emerging large packages)
Tried to re-emerge libreoffice, it took 13 minutes (on 4.2GHz), compared to almost 19 on stock speed (3.2GHz) on all 16 cores.

Last edited by dockland (2017-08-01 20:26:00)

Arch Linux

#1 2017-07-31 20:03:21

[SOLVED] XMP overclock shows in UEFI but not in Arch Linux

#2 2017-08-01 11:27:38

Re: [SOLVED] XMP overclock shows in UEFI but not in Arch Linux

#3 2017-08-01 11:32:00

Re: [SOLVED] XMP overclock shows in UEFI but not in Arch Linux

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