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Why is the DPC latency high on Windows 8?
I cannot recall what it was in Windows 7 exactly, but it was much less than 500us. In Windows 8, it never drops below 1000us.
I measured the DPC Latency using the
DPC Latency Checker .
Any idea why this is? Immature drivers? (Specs in the sig btw)
This is also on the *leaked* Windows 8 x64 Enterprise. (Don't worry, I have MSDN and am getting the real thing on 15th
)
OS
Windows 8.1 Pro x64
Computer type
PC/Desktop
System Manufacturer/Model
DIY
CPU
Intel Core i7 4790K @4.5GHz
Motherboard
Asus ROG Maximus VII Gene
Memory
16GB A-DATA DDR3-2400
Graphics Card(s)
Gigabyte GTX 970 Gaming G1
Monitor(s) Displays
QNIX QX2710
Screen Resolution
2560x1440
Hard Drives
Samsung 840 series 250GB
Toshiba DT01ACA300 3TB (Data)
Western Digital Caviar Green WD30EZRX-00DC0B0 3TB (Backup)
PSU
Silversonte G series 750W
Case
Silverstone Sugo SG09
Cooling
Noctua NH-U12S
Keyboard
Generic
Mouse
Logitech G602
Internet Speed
200Mbps/200Mbps Fibre
Browser
Google Chrome
Antivirus
Windows Defender
LatencyMon should tell you which driver is responsible.
OS
Windows 8.1 Pro with Media Center
LatencyMon should tell you which driver is responsible.
here are the results.
so nVidia driver is the culprit?
OS
Windows 8.1 Pro x64
Computer type
PC/Desktop
System Manufacturer/Model
DIY
CPU
Intel Core i7 4790K @4.5GHz
Motherboard
Asus ROG Maximus VII Gene
Memory
16GB A-DATA DDR3-2400
Graphics Card(s)
Gigabyte GTX 970 Gaming G1
Monitor(s) Displays
QNIX QX2710
Screen Resolution
2560x1440
Hard Drives
Samsung 840 series 250GB
Toshiba DT01ACA300 3TB (Data)
Western Digital Caviar Green WD30EZRX-00DC0B0 3TB (Backup)
PSU
Silversonte G series 750W
Case
Silverstone Sugo SG09
Cooling
Noctua NH-U12S
Keyboard
Generic
Mouse
Logitech G602
Internet Speed
200Mbps/200Mbps Fibre
Browser
Google Chrome
Antivirus
Windows Defender
so nVidia driver is the culprit?
Looks that way. Google /"windows 8" dpc latency nvidia 304.79/ and you'll find others talking about it.
OS
Windows 8.1 Pro with Media Center
taken from
DPC Latency Checker
"Windows 8 Compatibility: The DPC latency utility runs on Windows 8 but does not show correct values. The output suggests that the Windows 8 kernel performs badly and introduces a constant latency of one millisecond which is not the case in practice. DPCs in the Windows 8 kernel behave identical to Windows 7. The utility produces incorrect results because the implementation of kernel timers has changed in Windows 8 which causes a side effect with the measuring algorithm used by the utility. Thesycon is working on a new version of the DPC latency utility and will make it available on this site as soon as it is finished"
IE don't worry about it. In fact from something I read Cakewalk (who make a DAW called Sonar) claimed improvements in core scheduling, latency, availability etc.
The Cakewalk Blog » Blog Archive » Windows 8 – A benchmark for music production applications
CDJay
OS
Windows 8.1 Pro x64
Computer type
PC/Desktop
System Manufacturer/Model
DIY
CPU
Intel Core i7 4790K @4.5GHz
Motherboard
Asus ROG Maximus VII Gene
Memory
16GB A-DATA DDR3-2400
Graphics Card(s)
Gigabyte GTX 970 Gaming G1
Monitor(s) Displays
QNIX QX2710
Screen Resolution
2560x1440
Hard Drives
Samsung 840 series 250GB
Toshiba DT01ACA300 3TB (Data)
Western Digital Caviar Green WD30EZRX-00DC0B0 3TB (Backup)
PSU
Silversonte G series 750W
Case
Silverstone Sugo SG09
Cooling
Noctua NH-U12S
Keyboard
Generic
Mouse
Logitech G602
Internet Speed
200Mbps/200Mbps Fibre
Browser
Google Chrome
Antivirus
Windows Defender