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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598152728 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598152928 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. Reveal hidden contents Before: After: Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153324 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 01:14, LimeMaster said: The patch seems a tad glitchy on older CPUs. Reveal hidden contents Before: After: Expand What does that test even do? Performance is not hampered across the board. Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153346 Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 01:38, adrynalyne said: What does that test even do? Performance is not hampered across the board. Expand I believe it's suppose to benchmark the CPU. Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153358 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 01:45, LimeMaster said: I believe it's suppose to benchmark the CPU. Expand I’m sure, but what is it actually doing to test it? Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153374 Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 02:03, adrynalyne said: I’m sure, but what is it actually doing to test it? Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153380 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 02:16, LimeMaster said: No clue. There doesn't seem to be documentation of what the tests entail. Both tests (stress and bench) have similar results. Expand If its just calculating pi, for example, the patch won't affect it at all. LimeMaster 1 Share Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153386 Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 02:25, adrynalyne said: If its just calculating pi, for example, the patch won't affect it at all. Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153390 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153396 Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 02:52, 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 Expand I understand why Linus is angry then. Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153412 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 03:37, LimeMaster said: I understand why Linus is angry then. Expand So here is the thing--is he angry because he was unable to get performance better, vs. Windows? Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153414 Share on other sites More sharing options...
LimeMaster Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 03:38, adrynalyne said: So here is the thing--is he angry because he was unable to get performance better, vs. Windows? Expand That would be my guess. Of course he blames Intel because everything was technically running smoothly beforehand. adrynalyne 1 Share Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153416 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153438 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153680 Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 (edited) On 07/01/2018 at 16:06, 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/ Expand That's without the microcode update. Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153688 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 16:29, Mockingbird said: That's without the microcode update. Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153690 Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 (edited) On 07/01/2018 at 16:33, 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. Expand ...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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153692 Share on other sites More sharing options...
Yogurth Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 16:29, Mockingbird said: That's without the microcode update. Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153704 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 (edited) On 07/01/2018 at 16:37, 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. Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153722 Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 17:10, 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. Expand It's turned off, so no performance impact. PowerShell Install-Module SpeculationControl Set-ExecutionPolicy Bypass Get-SpeculationControlSettings Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153728 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 (edited) On 07/01/2018 at 17:15, Mockingbird said: It's turned off, so no performance impact. PowerShell Install-Module SpeculationControl Set-ExecutionPolicy Bypass Get-SpeculationControlSettings Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153730 Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 17:17, 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. Expand Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153734 Share on other sites More sharing options...
adrynalyne Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 17:20, Mockingbird said: Expand K. Here is mine. Kernel VA shadowing was never enabled, even pre-patch. Link to comment https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153736 Share on other sites More sharing options...
Mockingbird Posted January 7, 2018 Share Posted January 7, 2018 On 07/01/2018 at 17:22, adrynalyne said: K. Here is mine. Kernel VA shadowing was never enabled, even pre-patch. Expand 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 https://www.neowin.net/forum/topic/1352412-microsoft-kernel-patch-cpu-before-and-after-benchmarks-thread/page/3/#findComment-598153738 Share on other sites More sharing options...
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