Rasprava i komentari o "Spectre" i "Meltdown" pošastima

[Mladenxy]

Autor kopija

https://access.redhat.com/articles/3307751

Mislio sam na neki grafikon ili video koji bi pokazao testove igara prije i poslije zakrpe, koji bi potvrdio gubitak od 10% u gamingu.

[Gigi1]

GTA V, Meltdown/Spectre protection enabled:



Frames Per Second (Higher is better) Min, Max, Avg

Pass 0, 12.466310, 87.951523, 67.537834

Pass 1, 35.587948, 102.294464, 77.057365

Pass 2, 45.975742, 123.643021, 79.567863

Pass 3, 44.063927, 114.885742, 86.587761

Pass 4, 22.912081, 130.247345, 77.674034



GTA V, Meltdown/Spectre protection disabled:



Frames Per Second (Higher is better) Min, Max, Avg

Pass 0, 18.301443, 94.711319, 76.394928

Pass 1, 49.353958, 135.707306, 87.262985

Pass 2, 49.573666, 136.217514, 88.964317

Pass 3, 55.602509, 132.006226, 101.361748

Pass 4, 25.132448, 149.900314, 85.941391



Ghost Recon Wildlands, Meltdown/Spectre protection enabled:



FPS:Average: 50.48 Min: 34.72 Max: 56.16

GPU peak temp: 74

CPU usage: Average: 46.0% Min: 36.7% Max: 59.5%

GPU usage: Average: 76.1% Min: 65.8% Max: 86.1%

RAM usage: Average: 2.8 GB Min: 2.7 GB Max: 2.9 GB



Ghost Recon Wildlands, Meltdown/Spectre protection disabled:



FPS: Average: 54.50 Min: 45.14 Max: 58.59

GPU peak temp: 74

CPU usage: Average: 42.7% Min: 32.3% Max: 52.3%

GPU usage: Average: 81.9% Min: 62.5% Max: 92.3%

RAM usage: Average: 2.7 GB Min: 2.6 GB Max: 2.8 GB



It may be worth noting the higher CPU and lower GPU usage in Ghost Recon Wildlands with Meltdown/Spectre patches enabled, which may indicate TLB flushing is eating CPU cycles and bottlenecking the GPU in this scenario.



TL;DR

Meltdown/Spectre protection patches hit the performance of open-world games particularly hard on pre-Haswell CPUs.






Win10 Unpatched Win10 Meltdown Patch Win10 Meltdown + Microcode Patch
The Witcher 3, Ultra, No HairWorks 139.8fps 128.3fps 126.6fps
Rise of the Tomb Raider, Very High, DX12 121.6fps 117.2fps 121.6fps
Far Cry Primal, Ultra 128.4fps 127.0fps 126.2fps
Crysis 3, Very High 129.3fps 129.2fps 126.8fps
Ashes of the Singularity, CPU Test 35.3fps 35.5fps 35.6fps
Assassin's Creed Unity, Ultra High 131.1fps 131.2fps 130.3fps

[Mladenxy]

Ovdje su testirali i razlike su bile u jednoj igri, sa drugim intelom čak ni ni u toj jednoj igri...par postotaka razlike.

https://youtu.be/LC1WuKdPVCQ

[stef]

Ima i razlike koji je OS.
Win 10 navodno bolje podnosi Spectre/Meltdown patcheve.

[Gigi1]

Autor Mladenxy

Ovdje su testirali i razlike su bile u jednoj igri, sa drugim intelom čak ni ni u toj jednoj igri...par postotaka razlike.

https://youtu.be/LC1WuKdPVCQ

to ti je ova drugi dio rezultata sto sam stavio post ranije(Win10 Unpatched Win10 Meltdown Patch Win10 Meltdown + Microcode Patch), to je testirano 10.1.2018., ovo iznad gdje su osjetnije razilke je test iz 3.mj.2019. sa dodatnim zakrpama(1809 ver. win10)

[kopija]

Mislim da je Mladenxy pitao za utjecaj Retpoline patch-a.

[The Exiled]

Intel Tried to Bribe Dutch University to Suppress Knowledge of MDS Vulnerability

Dutch publication Nieuwe Rotterdamsche Courant reports that Intel offered to pay the researchers a USD $40,000 "reward" to allegedly get them to downplay the severity of the vulnerability, and backed their offer with an additional $80,000. The team politely refused both offers.

Izvor: TechPowerUp

[thunderbird]

A i jesu se isprsili s ponudom

[Gigi1]

Trebali su im travuljagu umjeso para ponudit, bolje bi prosli

[Mladenxy]

Treba pričekati da netko relevantan napravi nove testove, po ovim prethodnim zakrpama nije se izgubilo praktički ništa za kućnog korisnika.

Osobno nisam ništa osjetio a windowsi se krpaju redovno kao i biosi na zadnje verzije.

https://www.youtube.com/watch?v=_qZksorJAuY

[Amd_Shill]

Intel i plave kuverte?
Ne mogu vjerovat.

[The Exiled]

Autor Mladenxy

Treba pričekati da netko relevantan napravi nove testove, po ovim prethodnim zakrpama nije se izgubilo praktički ništa za kućnog korisnika. Osobno nisam ništa osjetio a windowsi se krpaju redovno kao i biosi na zadnje verzije.

Noviji hardver još i relativno dobro podnosi sve te zakrpane peripetije, ali nažalost Sandy, Ivy, Haswell i Broadwell znaju pokleknuti, a još uvijek se koriste.

[Gigi1]

Ali i na novijima su razlike vece nakon 1809 ak sam dobro skuzio piskaranja po netu jer su dodatne zakrpe tad metnuli

Kroz koji tjedan ce se znat sto je s ovim zadnjim failom, kako te zakrpe utjecu na perf.

[Mladenxy]

Kažu ovdje

https://www.pcgamesn.com/intel/zombi...on-performance

Intel’s benchmarks suggest only a marginal decrease in within some tasks while Zombieload mitigations are in place.
Within the company’s in-house testing, a Core i9 9900K with HyperThreading enabled drops 3% performance in WebXPRT 3 testing. At best, it gained 1% within SPECint_rate_base 2017 (1 copy) testing.

Problem je ovo gašenje HT-a dok ne izdaju mikrokodove.

[thunderbird]

Je, a intelovim in-houe testiranjima je baš za vjerovati kao objektivnima i neovisnima

[The Exiled]

Kak god se okrene daleko je ovo od zajebancije koje će se "riješiti" hrpom zakrpa, koje pak same po sebi nisu nikakvo rješenje - pogotovo, ako se gubi dobar dio funkcionalnosti.

The full mitigation, which includes disabling hyper-threading, prevents information leakage across threads and when transitioning between kernel and user space, which is associated with the MDS vulnerabilities for both local and remote (web) attacks. Testing conducted by Apple in May 2019 showed as much as a 40 percent reduction in performance with tests that include multithreaded workloads and public benchmarks. Performance tests are conducted using specific Mac computers. Actual results will vary based on model, configuration, usage, and other factors.

Izvor: Apple

[Mladenxy]

Za taj dio me zaboli Nek mi ne diraju igre

[Gigi1]

intel in house benchmark hahaha, pa pokusali su potplatiti ekipu da se ne prosiri vijest, sto onda tek vele svojima koji su im na legalnoj platnoj listi...

[The Exiled]

The Performance Impact of MDS / Zombieload: The overall cost of Spectre/Meltdown/L1TF/MDS

The Intel systems all saw about 16% lower performance out-of-the-box now with these default mitigations and obviously even lower if disabling Hyper Threading for maximum security. The two AMD systems tested saw a 3% performance hit with the default mitigations. While there are minor differences between the systems to consider, the mitigation impact is enough to draw the Core i7 8700K much closer to the Ryzen 7 2700X and the Core i9 7980XE to the Threadripper 2990WX.

Izvor: Phoronix

[Mladenxy]

Evo nekaj testova sa isključenim HT-om.

https://www.youtube.com/watch?time_c...&v=a8yXqsfXWcM

[The Exiled]

Windows 10 Security Patch Slowed Intel Core i9 9900K in Pix4D, Metashape & RealityCapture

Single patch, to address a couple of CPU vulnerabilities, caused Intel's Core i9 9900K processor to take 2 to 11% longer to process image sets in these photogrammetry applications. This is not the first update that has addressed such weaknesses in modern CPUs, so I wouldn't be surprised if the overall impact from those cumulative patches is even bigger. Some applications might be affected even more heavily, while others could see little or no difference - and of course, different CPUs may be affected more or less with each discovered vulnerability and subsequent patch. I look forward to seeing if this performance drop on the 9900K (and related models) impacts what CPUs are the best for photogrammetry moving forward, and we will have articles covering that topic in the coming days.

Spectre/Meltdown/L1TF/MDS Mitigation costs on an Intel Dual Core + HT Laptop

Here are some benchmarks of a Lenovo ThinkPad with Core i7 Broadwell CPU looking at those mitigation costs, when using a Core i7 5600U with two physical cores plus Hyper Threading.
The default/out-of-the-box mitigations dropped the performance by 18% or 25% when disabling Hyper Threading.

ZombieLoad Mitigation Costs For Intel Haswell Xeon, Plus Overall Mitigation Impact

When looking at the current costs of all mitigations to date combined, that's a 13% hit using the same set of benchmarks carried out for the recent Xeon/EPYC comparison a few days back. If also disabling Hyper Threading, it equates to about a 19% hit.

Izvor: Puget Systems i Phoronix