{"action":"created","issue":{"url":"https://api.github.com/repos/dotnet/coreclr/issues/17932","repository_url":"https://api.github.com/repos/dotnet/coreclr","labels_url":"https://api.github.com/repos/dotnet/coreclr/issues/17932/labels{/name}","comments_url":"https://api.github.com/repos/dotnet/coreclr/issues/17932/comments","events_url":"https://api.github.com/repos/dotnet/coreclr/issues/17932/events","html_url":"https://github.com/dotnet/coreclr/issues/17932","id":321617147,"number":17932,"title":"Possible Performance Regression from 2.0.7 to 2.1-RC1 on Windows Server 2016 w/ Hyper-V Role","user":{"login":"Petermarcu","id":8228359,"avatar_url":"https://avatars3.githubusercontent.com/u/8228359?v=4","gravatar_id":"","url":"https://api.github.com/users/Petermarcu","html_url":"https://github.com/Petermarcu","followers_url":"https://api.github.com/users/Petermarcu/followers","following_url":"https://api.github.com/users/Petermarcu/following{/other_user}","gists_url":"https://api.github.com/users/Petermarcu/gists{/gist_id}","starred_url":"https://api.github.com/users/Petermarcu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Petermarcu/subscriptions","organizations_url":"https://api.github.com/users/Petermarcu/orgs","repos_url":"https://api.github.com/users/Petermarcu/repos","events_url":"https://api.github.com/users/Petermarcu/events{/privacy}","received_events_url":"https://api.github.com/users/Petermarcu/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":9,"created_at":"2018-05-09T15:26:12Z","updated_at":"2018-05-10T08:02:16Z","closed_at":null,"author_association":"MEMBER","body":"@Mike-EEE commented on [Wed May 09 2018](https://github.com/dotnet/core/issues/1524)\n\nHello .NET Core Team and Community,\r\n\r\nI have a very interesting performance issue for you here.  I have produced some code that demonstrates a regressing difference in performance when switching from the .NET Core 2.0.x runtime to 2.1-RC1 on my Windows Server 2016 machine that I am using as a Hyper-V server.  Please note that I am also using Visual Studio 2017 15.7.1 in producing my output here.\r\n\r\nTo start, this issue has context that is most recently rooted in a Benchmark.NET issue that you [can view here](https://github.com/dotnet/BenchmarkDotNet/issues/739).  I have created a series of five benchmarks using the exact same underlying test code.  Each have a slight modification that produce different results in 2.0.7 when run on my Windows Server host machine (note: the host machine and not a VM instance).  You can see an [overview of this information here](https://github.com/dotnet/BenchmarkDotNet/issues/739#issuecomment-386811232).\r\n\r\nI took the code that is in the 3rd example, and by simply rebuilding it and running it in the 2.1 runtime, it produced slower results.  I have [created this 2.1 branch here](https://github.com/Mike-EEE/BenchmarkDotNet.InProcess/tree/TheWeird_03a) for your convenience.\r\n\r\n(Please do note that the results of each scenario are found in the README.md of their respective branches.)\r\n\r\nAdditionally, with a small change, I was once again able to produce the faster result times as seen in 2.0.7 but within the 2.1 runtime.  I have published this [branch here](https://github.com/Mike-EEE/BenchmarkDotNet.InProcess/tree/TheWeird_03b).  This is consistent with the bizarre behavior referenced in the five earlier examples, but seen here in a different form (or configuration, for lack of a better term) in 2.1.\r\n\r\nI feel it's worthy to note that I believe that this is a gremlin of a problem that I have been chasing in .NET Core tooling since 1.1.  I have encountered the most weird of circumstances around this behavior while trying to benchmark code using Benchmark.NET.  You can see previous iterations of my previous, more complicated attempts at wrestling this beast here for your reference:\r\nhttps://github.com/dotnet/BenchmarkDotNet/issues/330\r\nhttps://github.com/dotnet/BenchmarkDotNet/issues/433\r\n\r\nNow that I have been able to show a (regressing) discrepancy in performance between 2.0.7 and 2.1 RC1 with a simple recompile, I believe this could be due to a tooling/SDK problem that has been around for some time now.  Fortunately, I have been able to capture it using a very simple project this time and am more than happy to share it now in hopes to finally tracking down this very weird issue. 😄 \r\n\r\nFinally, I will provide an overview of my Windows Server specifications here.\r\n\r\n```\r\nSummary\r\n\t\tOperating System\r\n\t\t\tWindows Server 2016 Standard 64-bit\r\n\t\tCPU\r\n\t\t\tIntel Core i7 4820K @ 3.70GHz\t38 °C\r\n\t\t\tIvy Bridge-E 22nm Technology\r\n\t\tRAM\r\n\t\t\t48.0GB DDR3 @ 792MHz (9-9-9-27)\r\n\t\tMotherboard\r\n\t\t\tASUSTeK COMPUTER INC. RAMPAGE IV EXTREME (LGA2011)\t30 °C\r\n\t\tGraphics\r\n\t\t\tVW246 (1920x1080@60Hz)\r\n\t\t\tG246HL (1920x1080@60Hz)\r\n\t\t\tVW246 (1920x1080@60Hz)\r\n\t\t\tVW246 (1920x1080@60Hz)\r\n\t\t\t2047MB NVIDIA GeForce GTX 660 (Gigabyte)\t30 °C\r\n\t\tStorage\r\n\t\t\t238GB Samsung SSD 840 PRO Series (SSD)\t25 °C\r\n\t\t\t892GB Microsoft Storage Space Device (SSD)\t28 °C\r\n\t\t\t463GB Microsoft Storage Space Device (SSD)\t28 °C\r\n\t\t\t1536GB SYNOLOGY iSCSI Storage SCSI Disk Device (iSCSI)\r\n\t\tOptical Drives\r\n\t\t\tNo optical disk drives detected\r\n\t\tAudio\r\n\t\t\tHigh Definition Audio Device\r\nOperating System\r\n\tWindows Server 2016 Standard 64-bit\r\n\tComputer type: Virtual\r\n\tInstallation Date: 5/8/2017 4:41:12 PM\r\n\r\nCPU\r\n\t\tIntel Core i7 4820K\r\n\t\t\tCores\t4\r\n\t\t\tThreads\t8\r\n\t\t\tName\tIntel Core i7 4820K\r\n\t\t\tCode Name\tIvy Bridge-E\r\n\t\t\tPackage\tSocket 2011 LGA\r\n\t\t\tTechnology\t22nm\r\n\t\t\tSpecification\tIntel Core i7-4820K CPU @ 3.70GHz\r\n\t\t\tFamily\t6\r\n\t\t\tExtended Family\t6\r\n\t\t\tModel\tE\r\n\t\t\tExtended Model\t3E\r\n\t\t\tStepping\t4\r\n\t\t\tRevision\tS0/S1\r\n\t\t\tInstructions\tMMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, Intel 64, NX, AES, AVX\r\n\t\t\tVirtualization\tNot supported\r\n\t\t\tHyperthreading\tSupported, Enabled\r\n\t\t\tFan Speed\t594 RPM\r\n\t\t\tRated Bus Speed\t3167.2 MHz\r\n\t\t\tStock Core Speed\t3700 MHz\r\n\t\t\tStock Bus Speed\t100 MHz\r\n\t\t\tAverage Temperature\t38 °C\r\n\t\t\t\tCaches\r\n\t\t\t\t\tL1 Data Cache Size\t4 x 32 KBytes\r\n\t\t\t\t\tL1 Instructions Cache Size\t4 x 32 KBytes\r\n\t\t\t\t\tL2 Unified Cache Size\t4 x 256 KBytes\r\n\t\t\t\t\tL3 Unified Cache Size\t10240 KBytes\r\n\t\t\t\tCores\r\n\t\t\t\t\t\tCore 0\r\n\t\t\t\t\t\t\tCore Speed\t4552.8 MHz\r\n\t\t\t\t\t\t\tMultiplier\tx 46.0\r\n\t\t\t\t\t\t\tBus Speed\t99.0 MHz\r\n\t\t\t\t\t\t\tRated Bus Speed\t3167.2 MHz\r\n\t\t\t\t\t\t\tTemperature\t35 °C\r\n\t\t\t\t\t\t\tThreads\tAPIC ID: 0, 1\r\n\t\t\t\t\t\tCore 1\r\n\t\t\t\t\t\t\tCore Speed\t4651.8 MHz\r\n\t\t\t\t\t\t\tMultiplier\tx 47.0\r\n\t\t\t\t\t\t\tBus Speed\t99.0 MHz\r\n\t\t\t\t\t\t\tRated Bus Speed\t3167.2 MHz\r\n\t\t\t\t\t\t\tTemperature\t36 °C\r\n\t\t\t\t\t\t\tThreads\tAPIC ID: 2, 3\r\n\t\t\t\t\t\tCore 2\r\n\t\t\t\t\t\t\tCore Speed\t4552.8 MHz\r\n\t\t\t\t\t\t\tMultiplier\tx 46.0\r\n\t\t\t\t\t\t\tBus Speed\t99.0 MHz\r\n\t\t\t\t\t\t\tRated Bus Speed\t3167.2 MHz\r\n\t\t\t\t\t\t\tTemperature\t42 °C\r\n\t\t\t\t\t\t\tThreads\tAPIC ID: 4, 5\r\n\t\t\t\t\t\tCore 3\r\n\t\t\t\t\t\t\tCore Speed\t4552.8 MHz\r\n\t\t\t\t\t\t\tMultiplier\tx 46.0\r\n\t\t\t\t\t\t\tBus Speed\t99.0 MHz\r\n\t\t\t\t\t\t\tRated Bus Speed\t3167.2 MHz\r\n\t\t\t\t\t\t\tTemperature\t38 °C\r\n\t\t\t\t\t\t\tThreads\tAPIC ID: 6, 7\r\nRAM\r\n\t\tMemory slots\r\n\t\t\tTotal memory slots\t8\r\n\t\t\tUsed memory slots\t6\r\n\t\t\tFree memory slots\t2\r\n\t\tMemory\r\n\t\t\tType\tDDR3\r\n\t\t\tSize\t49152 MBytes\r\n\t\t\tDRAM Frequency\t791.8 MHz\r\n\t\t\tCAS# Latency (CL)\t9 clocks\r\n\t\t\tRAS# to CAS# Delay (tRCD)\t9 clocks\r\n\t\t\tRAS# Precharge (tRP)\t9 clocks\r\n\t\t\tCycle Time (tRAS)\t27 clocks\r\n\t\t\tCommand Rate (CR)\t2T\r\n\t\tPhysical Memory\r\n\t\t\tMemory Usage\t64 %\r\n\t\t\tTotal Physical\t48 GB\r\n\t\t\tAvailable Physical\t17 GB\r\n\t\t\tTotal Virtual\t96 GB\r\n\t\t\tAvailable Virtual\t64 GB\r\n\t\tSPD\r\n\t\t\tNumber Of SPD Modules\t6\r\n\t\t\t\tSlot #1\r\n\t\t\t\t\tType\tDDR3\r\n\t\t\t\t\tSize\t8192 MBytes\r\n\t\t\t\t\tManufacturer\tKingston\r\n\t\t\t\t\tMax Bandwidth\tPC3-10700 (667 MHz)\r\n\t\t\t\t\tPart Number\tKHX2133C11D3/8GX\r\n\t\t\t\t\tWeek/year\t42 / 13\r\n\t\t\t\t\tSPD Ext.\tXMP\r\n\t\t\t\t\t\tTiming table\r\n\t\t\t\t\t\t\t\tJEDEC #1\r\n\t\t\t\t\t\t\t\t\tFrequency\t457.1 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t6.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t6\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t6\r\n\t\t\t\t\t\t\t\t\ttRAS\t17\r\n\t\t\t\t\t\t\t\t\ttRC\t23\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #2\r\n\t\t\t\t\t\t\t\t\tFrequency\t533.3 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t7.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t7\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t7\r\n\t\t\t\t\t\t\t\t\ttRAS\t20\r\n\t\t\t\t\t\t\t\t\ttRC\t27\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #3\r\n\t\t\t\t\t\t\t\t\tFrequency\t609.5 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t8.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t8\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t8\r\n\t\t\t\t\t\t\t\t\ttRAS\t22\r\n\t\t\t\t\t\t\t\t\ttRC\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #4\r\n\t\t\t\t\t\t\t\t\tFrequency\t666.7 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t9.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t9\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t9\r\n\t\t\t\t\t\t\t\t\ttRAS\t24\r\n\t\t\t\t\t\t\t\t\ttRC\t33\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tXMP-2132\r\n\t\t\t\t\t\t\t\t\tFrequency\t1066 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t11.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t12\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t11\r\n\t\t\t\t\t\t\t\t\ttRAS\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.600 V\r\n\t\t\t\tSlot #2\r\n\t\t\t\t\tType\tDDR3\r\n\t\t\t\t\tSize\t8192 MBytes\r\n\t\t\t\t\tManufacturer\tKingston\r\n\t\t\t\t\tMax Bandwidth\tPC3-10700 (667 MHz)\r\n\t\t\t\t\tPart Number\tKHX2133C11D3/8GX\r\n\t\t\t\t\tWeek/year\t42 / 13\r\n\t\t\t\t\tSPD Ext.\tXMP\r\n\t\t\t\t\t\tTiming table\r\n\t\t\t\t\t\t\t\tJEDEC #1\r\n\t\t\t\t\t\t\t\t\tFrequency\t457.1 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t6.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t6\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t6\r\n\t\t\t\t\t\t\t\t\ttRAS\t17\r\n\t\t\t\t\t\t\t\t\ttRC\t23\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #2\r\n\t\t\t\t\t\t\t\t\tFrequency\t533.3 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t7.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t7\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t7\r\n\t\t\t\t\t\t\t\t\ttRAS\t20\r\n\t\t\t\t\t\t\t\t\ttRC\t27\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #3\r\n\t\t\t\t\t\t\t\t\tFrequency\t609.5 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t8.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t8\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t8\r\n\t\t\t\t\t\t\t\t\ttRAS\t22\r\n\t\t\t\t\t\t\t\t\ttRC\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #4\r\n\t\t\t\t\t\t\t\t\tFrequency\t666.7 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t9.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t9\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t9\r\n\t\t\t\t\t\t\t\t\ttRAS\t24\r\n\t\t\t\t\t\t\t\t\ttRC\t33\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tXMP-2132\r\n\t\t\t\t\t\t\t\t\tFrequency\t1066 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t11.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t12\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t11\r\n\t\t\t\t\t\t\t\t\ttRAS\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.600 V\r\n\t\t\t\tSlot #3\r\n\t\t\t\t\tType\tDDR3\r\n\t\t\t\t\tSize\t8192 MBytes\r\n\t\t\t\t\tManufacturer\tKingston\r\n\t\t\t\t\tMax Bandwidth\tPC3-10700 (667 MHz)\r\n\t\t\t\t\tPart Number\tKHX2133C11D3/8GX\r\n\t\t\t\t\tWeek/year\t42 / 13\r\n\t\t\t\t\tSPD Ext.\tXMP\r\n\t\t\t\t\t\tTiming table\r\n\t\t\t\t\t\t\t\tJEDEC #1\r\n\t\t\t\t\t\t\t\t\tFrequency\t457.1 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t6.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t6\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t6\r\n\t\t\t\t\t\t\t\t\ttRAS\t17\r\n\t\t\t\t\t\t\t\t\ttRC\t23\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #2\r\n\t\t\t\t\t\t\t\t\tFrequency\t533.3 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t7.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t7\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t7\r\n\t\t\t\t\t\t\t\t\ttRAS\t20\r\n\t\t\t\t\t\t\t\t\ttRC\t27\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #3\r\n\t\t\t\t\t\t\t\t\tFrequency\t609.5 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t8.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t8\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t8\r\n\t\t\t\t\t\t\t\t\ttRAS\t22\r\n\t\t\t\t\t\t\t\t\ttRC\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #4\r\n\t\t\t\t\t\t\t\t\tFrequency\t666.7 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t9.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t9\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t9\r\n\t\t\t\t\t\t\t\t\ttRAS\t24\r\n\t\t\t\t\t\t\t\t\ttRC\t33\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tXMP-2132\r\n\t\t\t\t\t\t\t\t\tFrequency\t1066 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t11.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t12\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t11\r\n\t\t\t\t\t\t\t\t\ttRAS\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.600 V\r\n\t\t\t\tSlot #4\r\n\t\t\t\t\tType\tDDR3\r\n\t\t\t\t\tSize\t8192 MBytes\r\n\t\t\t\t\tManufacturer\tKingston\r\n\t\t\t\t\tMax Bandwidth\tPC3-10700 (667 MHz)\r\n\t\t\t\t\tPart Number\tKHX2133C11D3/8GX\r\n\t\t\t\t\tWeek/year\t42 / 13\r\n\t\t\t\t\tSPD Ext.\tXMP\r\n\t\t\t\t\t\tTiming table\r\n\t\t\t\t\t\t\t\tJEDEC #1\r\n\t\t\t\t\t\t\t\t\tFrequency\t457.1 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t6.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t6\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t6\r\n\t\t\t\t\t\t\t\t\ttRAS\t17\r\n\t\t\t\t\t\t\t\t\ttRC\t23\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #2\r\n\t\t\t\t\t\t\t\t\tFrequency\t533.3 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t7.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t7\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t7\r\n\t\t\t\t\t\t\t\t\ttRAS\t20\r\n\t\t\t\t\t\t\t\t\ttRC\t27\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #3\r\n\t\t\t\t\t\t\t\t\tFrequency\t609.5 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t8.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t8\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t8\r\n\t\t\t\t\t\t\t\t\ttRAS\t22\r\n\t\t\t\t\t\t\t\t\ttRC\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #4\r\n\t\t\t\t\t\t\t\t\tFrequency\t666.7 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t9.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t9\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t9\r\n\t\t\t\t\t\t\t\t\ttRAS\t24\r\n\t\t\t\t\t\t\t\t\ttRC\t33\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tXMP-2132\r\n\t\t\t\t\t\t\t\t\tFrequency\t1066 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t11.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t12\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t11\r\n\t\t\t\t\t\t\t\t\ttRAS\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.600 V\r\n\t\t\t\tSlot #5\r\n\t\t\t\t\tType\tDDR3\r\n\t\t\t\t\tSize\t8192 MBytes\r\n\t\t\t\t\tManufacturer\tKingston\r\n\t\t\t\t\tMax Bandwidth\tPC3-10700 (667 MHz)\r\n\t\t\t\t\tPart Number\tKHX2133C11D3/8GX\r\n\t\t\t\t\tWeek/year\t42 / 13\r\n\t\t\t\t\tSPD Ext.\tXMP\r\n\t\t\t\t\t\tTiming table\r\n\t\t\t\t\t\t\t\tJEDEC #1\r\n\t\t\t\t\t\t\t\t\tFrequency\t457.1 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t6.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t6\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t6\r\n\t\t\t\t\t\t\t\t\ttRAS\t17\r\n\t\t\t\t\t\t\t\t\ttRC\t23\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #2\r\n\t\t\t\t\t\t\t\t\tFrequency\t533.3 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t7.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t7\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t7\r\n\t\t\t\t\t\t\t\t\ttRAS\t20\r\n\t\t\t\t\t\t\t\t\ttRC\t27\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #3\r\n\t\t\t\t\t\t\t\t\tFrequency\t609.5 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t8.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t8\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t8\r\n\t\t\t\t\t\t\t\t\ttRAS\t22\r\n\t\t\t\t\t\t\t\t\ttRC\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #4\r\n\t\t\t\t\t\t\t\t\tFrequency\t666.7 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t9.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t9\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t9\r\n\t\t\t\t\t\t\t\t\ttRAS\t24\r\n\t\t\t\t\t\t\t\t\ttRC\t33\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tXMP-2132\r\n\t\t\t\t\t\t\t\t\tFrequency\t1066 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t11.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t12\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t11\r\n\t\t\t\t\t\t\t\t\ttRAS\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.600 V\r\n\t\t\t\tSlot #6\r\n\t\t\t\t\tType\tDDR3\r\n\t\t\t\t\tSize\t8192 MBytes\r\n\t\t\t\t\tManufacturer\tKingston\r\n\t\t\t\t\tMax Bandwidth\tPC3-10700 (667 MHz)\r\n\t\t\t\t\tPart Number\tKHX2133C11D3/8GX\r\n\t\t\t\t\tWeek/year\t42 / 13\r\n\t\t\t\t\tSPD Ext.\tXMP\r\n\t\t\t\t\t\tTiming table\r\n\t\t\t\t\t\t\t\tJEDEC #1\r\n\t\t\t\t\t\t\t\t\tFrequency\t457.1 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t6.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t6\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t6\r\n\t\t\t\t\t\t\t\t\ttRAS\t17\r\n\t\t\t\t\t\t\t\t\ttRC\t23\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #2\r\n\t\t\t\t\t\t\t\t\tFrequency\t533.3 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t7.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t7\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t7\r\n\t\t\t\t\t\t\t\t\ttRAS\t20\r\n\t\t\t\t\t\t\t\t\ttRC\t27\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #3\r\n\t\t\t\t\t\t\t\t\tFrequency\t609.5 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t8.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t8\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t8\r\n\t\t\t\t\t\t\t\t\ttRAS\t22\r\n\t\t\t\t\t\t\t\t\ttRC\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tJEDEC #4\r\n\t\t\t\t\t\t\t\t\tFrequency\t666.7 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t9.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t9\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t9\r\n\t\t\t\t\t\t\t\t\ttRAS\t24\r\n\t\t\t\t\t\t\t\t\ttRC\t33\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.500 V\r\n\t\t\t\t\t\t\t\tXMP-2132\r\n\t\t\t\t\t\t\t\t\tFrequency\t1066 MHz\r\n\t\t\t\t\t\t\t\t\tCAS# Latency\t11.0\r\n\t\t\t\t\t\t\t\t\tRAS# To CAS#\t12\r\n\t\t\t\t\t\t\t\t\tRAS# Precharge\t11\r\n\t\t\t\t\t\t\t\t\ttRAS\t30\r\n\t\t\t\t\t\t\t\t\tVoltage\t1.600 V\r\n```\r\n\r\nPlease let me know if you require any further information around this issue or my environment and I will be happy to get it for you.\r\n\r\nThank you for any assistance you can provide towards solving this issue!\n\n"},"comment":{"url":"https://api.github.com/repos/dotnet/coreclr/issues/comments/387982566","html_url":"https://github.com/dotnet/coreclr/issues/17932#issuecomment-387982566","issue_url":"https://api.github.com/repos/dotnet/coreclr/issues/17932","id":387982566,"user":{"login":"Mike-EEE","id":2931376,"avatar_url":"https://avatars2.githubusercontent.com/u/2931376?v=4","gravatar_id":"","url":"https://api.github.com/users/Mike-EEE","html_url":"https://github.com/Mike-EEE","followers_url":"https://api.github.com/users/Mike-EEE/followers","following_url":"https://api.github.com/users/Mike-EEE/following{/other_user}","gists_url":"https://api.github.com/users/Mike-EEE/gists{/gist_id}","starred_url":"https://api.github.com/users/Mike-EEE/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/Mike-EEE/subscriptions","organizations_url":"https://api.github.com/users/Mike-EEE/orgs","repos_url":"https://api.github.com/users/Mike-EEE/repos","events_url":"https://api.github.com/users/Mike-EEE/events{/privacy}","received_events_url":"https://api.github.com/users/Mike-EEE/received_events","type":"User","site_admin":false},"created_at":"2018-05-10T08:02:16Z","updated_at":"2018-05-10T08:02:16Z","author_association":"NONE","body":"Ah @mikedn all the results you have seen to date with the exception of the one I just posted have been on my Windows Server 2016 that acts as a Hyper-V server.  I just now posted my very first Surface Pro _3_ results. \r\n\r\nAdditionally I would like to note that I also have a development VM based on Windows 10 that runs on that Windows Server and it gets a completely different set of results altogether.  As Benchmark.NET mentions, VMs have been known to get different results so I have not yet included these in my findings to reduce the overall complexity and information here.  As I said earlier... a lot of considerations going on here. 😆 "}}
{"actor":{"display_login":"Mike-EEE"}}