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In Reply to: RE: It runs! posted by fmak on January 04, 2017 at 22:57:19
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:00000008I 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 01/04/17Follow Ups:
That's right, but inmates pay hundreds of dollars for multiple 'optimising' suites that modify not only the default OS but presumably each other. One inmates used 3 together for 'best' sound.
On a working PC, there can be 2 million files. When some are modified, who knows what the actual outcome will be for certain processes.
I personally would avoid dynamic programme that alter the OS as it runs audio or anything else.
Yup. It is ironic that so many folks spend tons of money in "damaging" their audio systems by activating rather than deactivating or at least reducing unneeded activity. And randomness is even worse.Sure, some of the best-sounding systems are so minimalist that it is actually hard to keep them as easy to use as one wished. Still, I keep a dedicated (XP "bareboned/optimized") audio PC that is isolated from the world. Furthermore, when I want it doing its best, I manually defeat most "services" after bootup. It is several minutes of work after a bootup...but then I can listen for many hours. A musician friend of mine once laughed until we compared, using 3 DACs and 2 other PC's (Win7/10). In good spirit, he then said that his own Teac USB DAC wanted to buy my "scruffy PC" :))
Naturally, most folks need a higher level of convenience than what is consistent with the best sound. Then, many just throw money in and...we are expected to believe that solves the issue as easily...
Edits: 01/18/17
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