Computer Audio Asylum

Not sure what those hotshots are doing, but

108.234.77.201

Dawnrazor

In Reply to: RE: Realtime Linux Latencies posted by emailtim on February 04, 2021 at 10:39:59

its possible to do way better with windows

Cut to razor sounding violins

Follow Ups:

RE: Not sure what those hotshots are doing, but - emailtim 13:08:48 02/04/21 (5)
Dawnrazor,
I believe they were running HQPlayer.
What are you running it on (OS and CPU) and what audio app(s) are playing what formats ?
I have never seen DPC that low on any of my Win7 machines.

Edits: 02/04/21 02/04/21
- RE: Not sure what those hotshots are doing, but - fmak 00:34:34 02/05/21 (0)
  That's because he used to be a Win tuner!
- RE: Not sure what those hotshots are doing, but - Dawnrazor 14:46:08 02/04/21 (3)
  This was not mine but I had the same results. Its a cicsmemory player build. Win Xp pro sp2 with all kind of OS slimming. The cpu on the site now is the i3 but I was using an earlier cpu which I forget and a gigabyte mobo 31 something is in my head. Cpu had 2 cores iirc.
  
  The machine JUST did audio. No nothing. No art work no network etc. THough there was the ability to do that kind of stuff, i don't know what that would have done to the latency.
  
  here is a link that contains the pict I posted.
  
  Sadly I cant get windows 10 anywhere near this. My devices report an avg latency of 2.6 msec and the dpc checker shows like what you posted.
  
  If anyone has some tricks on slimming windows 10 to get super low latency like the cmp2 build let me know. Since cics has disappeared, these boards arent as useful imho.
  
  Cut to razor sounding violins
  - https://www.audioasylum.com/forums/pcaudio/messages/3/35743. (Open in New Window)
  - RE: Not sure what those hotshots are doing, but - fmak 00:40:27 02/05/21 (0)
    The thing about XP is that, no matter what one does, the sound was not better, just different. W7 was the same. W8.1 is best. W10 is full of stuff that is useless for pure audio/video use and the background police/snooper are running all the time. Try getting rid of Edge and all that stuff comprehensively.
    
    I used to use dCS upsampler and dac as reference against vinyl.
  - RE: Not sure what those hotshots are doing, but - emailtim 15:54:50 02/04/21 (1)
    I did more reading and apparently DPC Latency Checker has issues with Windows 8 and 10. Others are recommending using LatencyMon which provides more information.
    That Win98 plot is stellar. Thanks for the link. Never saw one that low before, especially with anything running.
    Apparently NVIDIA drivers are an issue. They supposedly don't work with PREEMPT_RT Linux kernels (source AVLinux documentation) and also appear to be latency hogs on Windows. On this thread, users are disabling NVIDIA drivers to get lower latencies.
    https://www.techpowerup.com/forums/threads/dpc-latency-caused-by-nvidia-drivers.270771/
    
    NVIDIA drivers disabled:
    
    On Linux, I see the graphics system is using resources as well as SAMBA for accessing network shares. I can see where a headless endpoint that doesn't load graphics would lighten the load, but the network would still need to be active to at least receive remote control commands.
    Using a local library would eliminate the network share traffic.
    With PREEMPT_RT Debian 10, I am getting an average of 20us (using cyclictest) running JRMC26, desktop, network, network shares and a couple of terminals for monitor apps which is much lower latency doing the same under Win7-64. That is with [44.1 - 384]kHz PCM and 1X DSD via DoP playing. My maximum latencies are also 1/10th what is seen above with the NVIDIA drivers disabled.
    
    Edits: 02/04/21 02/04/21
    - RE: Not sure what those hotshots are doing, but - fmak 00:44:32 02/05/21 (0)
      I got rid of all the useless nVidia stuff but for video it is more controllable and much better than Radion.
      
      I don't know why DLP has suddenly worked with W 10 but I doubt that it is giving the right info.

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