fearandleb Posted July 26, 2015 Share Posted July 26, 2015 Hi, I have a long itching problem: Supermicro X9Dai Dual Socket with two Sandy Bridge-E E5-2670. Yosemite running fine and all is working well including Power Management with patched AICPUPM.Kext (If anyones interested, throw me a line, glad to send my config) But the Setup works only with HT disabled, eg. 16 Cores. If I enable HT to 32 Logical Cores, I get Kernel Panic @ Boot, backtrace is AICPUPM.kext. With Mavericks, everything worked fine (had to use the ACPI/PCI Drivers from 10.9.1 though because it got terrible unresponsive if using the newer ones. So is there a hardlimit in the Darwin 14.X.X Kernel somewhere to not allow more than 16 Cores or is it maybe a ACPI DSDT Problem? Is there maybe a Kernel patch which could work? Thanks for help! Mike Link to comment https://www.insanelymac.com/forum/topic/307308-unable-to-boot-yosemite-with-ht-enabled-and-more-than-16-logical-cores/ Share on other sites More sharing options...
vusun123 Posted July 26, 2015 Share Posted July 26, 2015 That's OS X limitation for you. I believed Rampage Dev once said something about this. If it got backtrace by AICPUPM, try removing your current SSDT.aml, boot with GenerateP/CState=True then recreate it Link to comment https://www.insanelymac.com/forum/topic/307308-unable-to-boot-yosemite-with-ht-enabled-and-more-than-16-logical-cores/#findComment-2155624 Share on other sites More sharing options...
fearandleb Posted July 26, 2015 Author Share Posted July 26, 2015 Hi, what means OSX Limitation for me? Is there a general limit in the darwin kernel for logical cores opposed to the 13.X.X Kernel? There is no difference in booting with or without SSDT.aml, with or without Generate P/C State or not and with or without patching AICPUPM.kext. And I believe the Mac Pro6,1 12 Cores has Hyperthreading enabled which would lead to 24 logical cores. Rampagedev sent me a patched kernel once, but was 14.0.0 and he could not tell me what kind of patch it was applied to that kernel, as he did the patching not himself, I believe. Link to comment https://www.insanelymac.com/forum/topic/307308-unable-to-boot-yosemite-with-ht-enabled-and-more-than-16-logical-cores/#findComment-2155626 Share on other sites More sharing options...
vusun123 Posted July 26, 2015 Share Posted July 26, 2015 Hi, what means OSX Limitation for me? Is there a general limit in the darwin kernel for logical cores opposed to the 13.X.X Kernel? There is no difference in booting with or without SSDT.aml, with or without Generate P/C State or not and with or without patching AICPUPM.kext. And I believe the Mac Pro6,1 12 Cores has Hyperthreading enabled which would lead to 24 logical cores. Rampagedev sent me a patched kernel once, but was 14.0.0 and he could not tell me what kind of patch it was applied to that kernel, as he did the patching not himself, I believe. Yup, that's the case. I saw a post where he said that you cannot boot with HT Enabled when the logical cores reaches 32 Link to comment https://www.insanelymac.com/forum/topic/307308-unable-to-boot-yosemite-with-ht-enabled-and-more-than-16-logical-cores/#findComment-2155630 Share on other sites More sharing options...
fearandleb Posted July 26, 2015 Author Share Posted July 26, 2015 Yeah, but it is logical cores not more than 16. But there must be possibility to remove that limitation somehow, like I got this patched kernel. So you don't know who maybe would know how to patch the 14.4.0 kernel? Link to comment https://www.insanelymac.com/forum/topic/307308-unable-to-boot-yosemite-with-ht-enabled-and-more-than-16-logical-cores/#findComment-2155635 Share on other sites More sharing options...
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