My research into AMD's Linux "Performance Marginality" issue:

HTC · Jan 3, 2018

@ OP: did your problem manifest itself like this (around the middle, to the left)?

I haven't removed the cooler to look @ the CPU's date, yet. I'm kind of afraid, lol.

eidairaman1 · Jan 3, 2018

HTC said:
@ OP: did your problem manifest itself like this (around the middle, to the left)?

View attachment 95499

I haven't removed the cooler to look @ the CPU's date, yet. I'm kind of afraid, lol.

Check your private message via the envelope icon at top please

qubit · Jan 3, 2018

Nice one, RTB.

HTC · Jan 3, 2018

eidairaman1 said:
Check your private message via the envelope icon at top please

Just replied. Thanks!

R-T-B · Jan 3, 2018

HTC said:
@ OP: did your problem manifest itself like this (around the middle, to the left)?

View attachment 95499

I haven't removed the cooler to look @ the CPU's date, yet. I'm kind of afraid, lol.

Unfortunately, that's almost exactly what I got under load. Segfaults.

HTC · Jan 3, 2018

R-T-B said:
Unfortunately, that's almost exactly what I got under load. Segfaults.

In your opinion, should i try and RMA my CPU? Assuming ofc that the date on it is before the 25th week (that's the one, right?).

So far, that pic is the only instance i've noticed this. That doesn't mean it hasn't happened other times: that was the only one i've noticed.

R-T-B · Jan 4, 2018

HTC said:
In your opinion, should i try and RMA my CPU? Assuming ofc that the date on it is before the 25th week (that's the one, right?).

So far, that pic is the only instance i've noticed this. That doesn't mean it hasn't happened other times: that was the only one i've noticed.

It's up to you, but given the CPU they shipped me OC's like nuts, it may well be worth it for that alone.

The issue does not appear destructive in anyway, just annoying.

Vayra86 · Jan 5, 2018

@R-T-B did you consider at any point if this behaviour may have been related to a Spectre fix already? Either way, interesting read!

R-T-B · Jan 5, 2018

Vayra86 said:
@R-T-B did you consider at any point if this behaviour may have been related to a Spectre fix already? Either way, interesting read!

A linux toolkit I was involved with helping make (really just a bash shell script that poked at things to try and produce this bug) discovered that doing a lot of SYSCALLS to high registers produces a reboot. At the time, it was considered a pointless novelty, but it may have been a sign of spectre actually as spectre talks a lot about speculative execution screwing up on high registers.

If only I had realized what i was onto, maybe I could've got some project zero money... lol

But no, we dismissed it and moved on and never really finished anything, mostly because we all got RMAs and were happy. Good old laziness, she be a b*tch.

System Name	HTC's System
Processor	Ryzen 5 2600X
Motherboard	Asrock Taichi X370
Cooling	NH-C14, with the AM4 mounting kit
Memory	G.Skill Kit 16GB DDR4 F4 - 3200 C16D - 16 GTZB
Video Card(s)	Sapphire Nitro+ Radeon RX 480 OC 4 GB
Storage	1 Samsung NVMe 960 EVO 250 GB + 1 3.5" Seagate IronWolf Pro 6TB 7200RPM 256MB SATA III
Display(s)	LG 27UD58
Case	Fractal Design Define R6 USB-C
Audio Device(s)	Onboard
Power Supply	Corsair TX 850M 80+ Gold
Mouse	Razer Deathadder Elite
Software	Ubuntu 19.04 LTS

System Name	PCGOD
Processor	AMD FX 8350@ 5.0GHz
Motherboard	Asus TUF 990FX Sabertooth R2 2901 Bios
Cooling	Scythe Ashura, 2×BitFenix 230mm Spectre Pro LED (Blue,Green), 2x BitFenix 140mm Spectre Pro LED
Memory	16 GB Gskill Ripjaws X 2133 (2400 OC, 10-10-12-20-20, 1T, 1.65V)
Video Card(s)	AMD Radeon 290 Sapphire Vapor-X
Storage	Samsung 840 Pro 256GB, WD Velociraptor 1TB
Display(s)	NEC Multisync LCD 1700V (Display Port Adapter)
Case	AeroCool Xpredator Evil Blue Edition
Audio Device(s)	Creative Labs Sound Blaster ZxR
Power Supply	Seasonic 1250 XM2 Series (XP3)
Mouse	Roccat Kone XTD
Keyboard	Roccat Ryos MK Pro
Software	Windows 7 Pro 64

System Name	Quantumville™
Processor	Intel Core i7-2700K @ 4GHz
Motherboard	Asus P8Z68-V PRO/GEN3
Cooling	Noctua NH-D14
Memory	16GB (2 x 8GB Corsair Vengeance Black DDR3 PC3-12800 C9 1600MHz)
Video Card(s)	MSI RTX 2080 SUPER Gaming X Trio
Storage	Samsung 850 Pro 256GB \| WD Black 4TB \| WD Blue 6TB
Display(s)	ASUS ROG Strix XG27UQR (4K, 144Hz, G-SYNC compatible) \| Asus MG28UQ (4K, 60Hz, FreeSync compatible)
Case	Cooler Master HAF 922
Audio Device(s)	Creative Sound Blaster X-Fi Fatal1ty PCIe
Power Supply	Corsair AX1600i
Mouse	Microsoft Intellimouse Pro - Black Shadow
Keyboard	Yes
Software	Windows 10 Pro 64-bit

System Name	HTC's System
Processor	Ryzen 5 2600X
Motherboard	Asrock Taichi X370
Cooling	NH-C14, with the AM4 mounting kit
Memory	G.Skill Kit 16GB DDR4 F4 - 3200 C16D - 16 GTZB
Video Card(s)	Sapphire Nitro+ Radeon RX 480 OC 4 GB
Storage	1 Samsung NVMe 960 EVO 250 GB + 1 3.5" Seagate IronWolf Pro 6TB 7200RPM 256MB SATA III
Display(s)	LG 27UD58
Case	Fractal Design Define R6 USB-C
Audio Device(s)	Onboard
Power Supply	Corsair TX 850M 80+ Gold
Mouse	Razer Deathadder Elite
Software	Ubuntu 19.04 LTS

System Name	Pioneer
Processor	Ryzen R9 7950X
Motherboard	GIGABYTE Aorus Elite X670 AX
Cooling	Noctua NH-D15 + A whole lotta Sunon and Corsair Maglev blower fans...
Memory	64GB (4x 16GB) G.Skill Flare X5 @ DDR5-6000 CL30
Video Card(s)	XFX RX 7900 XTX Speedster Merc 310
Storage	2x Crucial P5 Plus 2TB PCIe 4.0 NVMe SSDs
Display(s)	55" LG 55" B9 OLED 4K Display
Case	Thermaltake Core X31
Audio Device(s)	TOSLINK->Schiit Modi MB->Asgard 2 DAC Amp->AKG Pro K712 Headphones or HDMI->B9 OLED
Power Supply	FSP Hydro Ti Pro 850W
Mouse	Logitech G305 Lightspeed Wireless
Keyboard	WASD Code v3 with Cherry Green keyswitches + PBT DS keycaps
Software	Gentoo Linux x64

My research into AMD's Linux "Performance Marginality" issue:

HTC

eidairaman1

The Exiled Airman

qubit

Overclocked quantum bit

HTC

R-T-B

HTC

R-T-B

Vayra86

R-T-B

Processor	i7 8700k 4.6Ghz @ 1.24V
Motherboard	AsRock Fatal1ty K6 Z370
Cooling	beQuiet! Dark Rock Pro 3
Memory	16GB Corsair Vengeance LPX 3200/C16
Video Card(s)	ASRock RX7900XT Phantom Gaming
Storage	Samsung 850 EVO 1TB + Samsung 830 256GB + Crucial BX100 250GB + Toshiba 1TB HDD
Display(s)	Gigabyte G34QWC (3440x1440)
Case	Fractal Design Define R5
Audio Device(s)	Harman Kardon AVR137 + 2.1
Power Supply	EVGA Supernova G2 750W
Mouse	XTRFY M42
Keyboard	Lenovo Thinkpad Trackpoint II
Software	W10 x64