https://bugs.winehq.org/show_bug.cgi?id=40191
--- Comment #8 from François Gouget fgouget@codeweavers.com --- Final notes from my TestBot timeline: * Configuring a QEMU VM to have 'two logical CPUs' results in a dual processor machine by default. However regular versions of Windows (i.e. non-Pro / Enterprise) are restricted to only use a single CPU. They will start on multi-processor machines but make use of only one. This is not an issue for our Windows 7 VMs as Pro and Ultimate versions can use up to two processor. But our Windows 8 and 10 VMs use regular editions. So they need QEMU to be configured with a single multi-core processor instead to properly test 'SMP' configurations. * On Windows 8+ the SpinCount value of the RtlInitializeCriticalSectionEx() tests in ntdll:rtl is different on a multi-core or hyperthreaded CPU than on a single single-core non-hyperthreaded one. On Window s7 SpinCount is 0 no matter what the processor configuration: multi-processor, multi-core or hyperthreading. So this is a Windows 8+ thing. On Windows 8 SpinCount may also take non-zero values on systems with multiple single-core non-hyperthreaded processors but we cannot test that configuration. * I changed wtbw8 to use a single dual-core processor. wtbwvista, wtbw864 and wtbw1064 will need similar changes.