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RE: It runs!

For whatever it's worth, here are the full settings recommended by "pkshan," author of the Foobar XA mod, for the MMCSS "SystemProfile" key/sub-keys - this is rather old, however, and pertained to Windows 7 - he's since taken a much more hands off approach to Windows 10, claiming that most changes make sound quality worse (for his particular player, mind you - he's a bit of an odd duck in terms of obsessive Windows SQ tweaking):

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile]
"NetworkThrottlingIndex"=dword:ffffffff
"SystemResponsiveness"=dword:0000000a

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Audio]
"Scheduling Category"="High"
"GPU Priority"=dword:0000001f
"Affinity"=dword:00000000
"Clock Rate"=dword:0000e2c2
"SFIO Priority"="High"
"Priority"=dword:00000001
"Background Only"="False"
"BackgroundPriority"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Capture]
"Scheduling Category"="Low"
"GPU Priority"=dword:00000008
"Affinity"=dword:00000000
"Clock Rate"=dword:00002710
"SFIO Priority"="Low"
"Priority"=dword:00000008
"Background Only"="True"
"BackgroundPriority"=dword:00000008

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Distribution]
"Scheduling Category"="Low"
"GPU Priority"=dword:00000008
"Affinity"=dword:00000000
"Clock Rate"=dword:00002710
"SFIO Priority"="Low"
"Priority"=dword:00000008
"Background Only"="True"
"BackgroundPriority"=dword:00000008

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Games]
"Scheduling Category"="Low"
"GPU Priority"=dword:00000008
"Affinity"=dword:00000000
"Clock Rate"=dword:00002710
"SFIO Priority"="Low"
"Priority"=dword:00000001
"Background Only"="True"
"BackgroundPriority"=dword:00000008

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Low Latency]
"Scheduling Category"="Medium"
"GPU Priority"=dword:00000008
"Affinity"=dword:00000000
"Clock Rate"=dword:00002710
"SFIO Priority"="Normal"
"Priority"=dword:00000006
"Background Only"="True"
"Latency Sensitive"="True"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Playback]
"Scheduling Category"="High"
"GPU Priority"=dword:0000001f
"Affinity"=dword:00000000
"BackgroundPriority"=dword:00000008
"Clock Rate"=dword:00002710
"SFIO Priority"="High"
"Priority"=dword:00000008
"Background Only"="False"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Pro Audio]
"Scheduling Category"="High"
"GPU Priority"=dword:0000001f
"Affinity"=dword:00000000
"Clock Rate"=dword:00005ab4
"SFIO Priority"="High"
"Priority"=dword:00000001
"Background Only"="False"
"BackgroundPriority"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Multimedia\SystemProfile\Tasks\Window Manager]
"Scheduling Category"="Low"
"GPU Priority"=dword:00000008
"Affinity"=dword:00000000
"Clock Rate"=dword:00002710
"SFIO Priority"="Low"
"Priority"=dword:00000008
"Background Only"="True"
"BackgroundPriority"=dword:00000008

I still am unsure if these actually effect Kernel Streaming or not. My W10 build is extremely minimalist and I have MMCSS disabled during playback (done via KS). I'll A/B with MMCSS enabled sometime to see if I can spot a difference.

When the above were first posted over at Tir Na Hifi (I think - have spread my attention over so many PC audio web boards over the last few years it's hard to differentiate at times) the consensus seemed to be that "Clock Rate" for "Audio" and/or "Pro Audio" made a very real SQ difference for most users, but a consensus on a value for those settings never was come to. Changes to the other entries made a negligible difference.




Edits: 01/04/17 01/04/17

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