Radium Posted January 6, 2018 Share Posted January 6, 2018 Tasks such as calculating Pi shouldn't show any negative effects since calculating Pi doesn't require any system calls. The performance hit comes from context switching which you essentially never do when you only calculate/estimate numbers. Link to comment Share on other sites More sharing options...
Mockingbird Posted January 6, 2018 Share Posted January 6, 2018 Epic Games's servers are getting hammered https://www.epicgames.com/fortnite/forums/news/announcements/132642-epic-services-stability-update Link to comment Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 The patch seems a tad glitchy on older CPUs. Spoiler Before: After: Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 23 minutes ago, LimeMaster said: The patch seems a tad glitchy on older CPUs. Hide contents Before: After: What does that test even do? Performance is not hampered across the board. Link to comment Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 1 minute ago, adrynalyne said: What does that test even do? Performance is not hampered across the board. I believe it's suppose to benchmark the CPU. Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 18 minutes ago, LimeMaster said: I believe it's suppose to benchmark the CPU. I’m sure, but what is it actually doing to test it? Link to comment Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 13 minutes ago, adrynalyne said: I’m sure, but what is it actually doing to test it? No clue. There doesn't seem to be documentation of what the tests entail. Both tests (stress and bench) have similar results. Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 8 minutes ago, LimeMaster said: No clue. There doesn't seem to be documentation of what the tests entail. Both tests (stress and bench) have similar results. If its just calculating pi, for example, the patch won't affect it at all. LimeMaster 1 Share Link to comment Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 12 minutes ago, adrynalyne said: If its just calculating pi, for example, the patch won't affect it at all. I figured the tests weren't exactly an accurate representation when comparing the results. It however did have a slight effect on the Multi Thread Ratio. It decreased after the patch was installed. Link to comment Share on other sites More sharing options...
neufuse Veteran Posted January 7, 2018 Veteran Share Posted January 7, 2018 It appears my SQL server 2017 benchmarks on windows actually saw a 2% performance increase after the patch In Linux SQL Server 2017 shows a 25% DECREASE in performance... ugh SQL Server does a lot of IO and system calls.... doing mass IO bench marking should show any problems with this patch adrynalyne and Mando 2 Share Link to comment Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 45 minutes ago, neufuse said: It appears my SQL server 2017 benchmarks on windows actually saw a 2% performance increase after the patch In Linux SQL Server 2017 shows a 25% DECREASE in performance... ugh SQL Server does a lot of IO and system calls.... doing mass IO bench marking should show any problems with this patch I understand why Linus is angry then. Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 Just now, LimeMaster said: I understand why Linus is angry then. So here is the thing--is he angry because he was unable to get performance better, vs. Windows? Link to comment Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 1 minute ago, adrynalyne said: So here is the thing--is he angry because he was unable to get performance better, vs. Windows? That would be my guess. Of course he blames Intel because everything was technically running smoothly beforehand. adrynalyne 1 Share Link to comment Share on other sites More sharing options...
fusi0n Posted January 7, 2018 Share Posted January 7, 2018 Ouch.. I'm building my AMD rig now.. Link to comment Share on other sites More sharing options...
Yogurth Posted January 7, 2018 Share Posted January 7, 2018 Updated Techspot analysis and benchmarks. Up to 5% drop in overall performance aside from massive SSD slowdown. Still no Windows server workload tests apart from the Epic Games login server meltdown if that is a Windows server at all. https://www.techspot.com/article/1556-meltdown-and-spectre-cpu-performance-windows/ GadgetPig 1 Share Link to comment Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 (edited) 22 minutes ago, Yogurth said: Updated Techspot analysis and benchmarks. Up to 5% drop in overall performance aside from massive SSD slowdown. Still no Windows server workload tests apart from the Epic Games login server meltdown if that is a Windows server at all. https://www.techspot.com/article/1556-meltdown-and-spectre-cpu-performance-windows/ That's without the microcode update. Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 2 minutes ago, Mockingbird said: That's without the microcode update. There hasn’t been enough testing with the microcode update to verify it. There is also a screenshot out there showing a massive performance hit after the meltdown patch on an AMD cpu. Just one that I saw. Link to comment Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 (edited) 5 minutes ago, adrynalyne said: There is also a screenshot out there showing a massive performance hit after the meltdown patch on an AMD cpu. Just one that I saw. ...except that, on Windows, kernel VA shadow is off when using AMD processors. Linux also disables kernel page-table isolation on AMD processors. Link to comment Share on other sites More sharing options...
Yogurth Posted January 7, 2018 Share Posted January 7, 2018 19 minutes ago, Mockingbird said: That's without the microcode update. Yup, this is Windows patch + BIOS update. The article is a work in progress and Techspot will update it when a new batch of patches arrives. Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 (edited) 34 minutes ago, Mockingbird said: ...except that, on Windows, kernel VA shadow is off when using AMD processors. Linux also disables kernel page-table isolation on AMD processors. Show me where it is turned off and causing a performance hit please. The specific indicator if you don't mind. Linux may disable kpti on AMD systems, but the NT kernel is not Linux. Link to comment Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 3 minutes ago, adrynalyne said: Show me where it is turned off and causing a performance hit please. The specific indicator if you don't mind. Linux may disable kpti on AMD systems, but the NT kernel is not Linux. It's turned off, so no performance impact. PowerShell Install-Module SpeculationControl Set-ExecutionPolicy Bypass Get-SpeculationControlSettings Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 (edited) 2 minutes ago, Mockingbird said: It's turned off, so no performance impact. PowerShell Install-Module SpeculationControl Set-ExecutionPolicy Bypass Get-SpeculationControlSettings I'll wait for your results patiently. I've got mine here. I want to see where Windows turned off kernel va shadowing post patch. Thats what you implied with what you said. Link to comment Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 2 minutes ago, adrynalyne said: I'll wait for your results patiently. I've got mine here. I want to see where Windows turned off kernel va shadowing post patch. Link to comment Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 Just now, Mockingbird said: K. Here is mine. Kernel VA shadowing was never enabled, even pre-patch. Link to comment Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 1 minute ago, adrynalyne said: K. Here is mine. Kernel VA shadowing was never enabled, even pre-patch. Which processor? On Intel processors, Kernel VA shadowing is disabled if incompatible Anti-Virus is detected. On AMD processors, Kernel VA shadowing is disabled. Link to comment Share on other sites More sharing options...
.thumb.jpg.958469f789995895cc0de1fb3c106d00.jpg)
Recommended Posts