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Windows 7: Process Scheduling Broken on Coffee Lake?

14 Apr 2018   #1
Buzz Armstrong

Windows 7 Professional 64-bit
Process Scheduling Broken on Coffee Lake?

Although officially Coffee Lake doesn't support Windows 7, it's easy to find drivers for everything but the integrated graphics on a board like the Asrock Extreme4 z370. Furthermore, even Windows Update seems to work without issue (no hacks needed), unlike the earlier Kaby Lake.

Don't believe me, see this link:
Anyone Tried Coffee Lake on Windows 7 Yet? : intel

However, I'm hitting a strange issue. I'm transitioning from an earlier machine with Windows 7 on a 3570k to Windows 7 on 8600k, using the very same Virtual PC SP1 software to run Windows 98 SE, and I'm finding that while apps on W98 in Virtual PC run smoothly on the 3570k, they don't on the 8600k. Instead, I get stuttering - an app like Novalogic F16 runs and then freezes once every second or so on the 8600k.

This doesn't make sense, because the new build is much faster. I've not seen problems with other software on it, and I've vetted the overclock with Prime95 and Aida64. Note that the Windows 7 files and Virtual PC SP1 app are the same on both machines - so only the hardware/chipset seem to be the variable. (Both machines have 32GB of RAM, and the VM on needs 256mb so that's not an issue.)

What I've tried so far, with no change:
- Disabling the overclock settings on the z370 build. Used stock settings. Also set the # of CPUs to 4 (from 6).
- Installed a fresh W98 copy onto a new virtual machine in Virtual PC SP1 on the 8600K. The stock install has the stuttering issue.
- Disabled all power-saving settings in Windows 7 (setting to "Performance" mode) and in the BIOS (disabling C sleep states).
- Disabled and Enabled HPET (high performance timer) in BIOS and in Windows 7 registry.
- Compared the loaded DLLs with Depends32. List of DLLs was the same.
- Played with process affinity on the 8600k to assign it to 2 or 1 CPU. 2 made no difference - 1 made it worse.

Any ideas? I don't want to be paranoid and assume the MS intentionally broke Windows 7 on Coffee Lake in such a mysterious way, but I'm not sure what else to believe at this point.

My System SpecsSystem Spec

 Process Scheduling Broken on Coffee Lake?

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