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Why is the DPC latency high on Windows 8?


Anusha

New Member
Member
Kawasaki, Japan

Posts
108
#1
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)

DPCLatency_Win8.jpg

This is also on the *leaked* Windows 8 x64 Enterprise. (Don't worry, I have MSDN and am getting the real thing on 15th ;))
 

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Anusha

New Member
Member
Kawasaki, Japan

Posts
108
#3

My Computer

System One

  • OS
    Windows 8.1 Pro x64
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    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

CDJay

Member
Member
Posts
17
#5
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
 

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Anusha

New Member
Member
Kawasaki, Japan

Posts
108
#6
Thanks.
 

My Computer

System One

  • OS
    Windows 8.1 Pro x64
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    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