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Ubuntu Desires Lower Audio Latency For Gaming

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  • #11
    Originally posted by christian_frank View Post
    to be more specific , this is only the fact for non hw mixing cards ...which sadly seem to be very popular nowadays ..i love my hw mixing soundblaster
    HW mixing is useless though. It was nice on my 486. That Gravis Ultrasound rocket the boat. But today, mixing can be done on the CPU so easily, it's not worth having it in HW.

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    • #12
      Originally posted by RealNC View Post
      HW mixing is useless though. It was nice on my 486. That Gravis Ultrasound rocket the boat. But today, mixing can be done on the CPU so easily, it's not worth having it in HW.
      The only reason I even joined the discussion in this thread are the listed 5ms vs. 25ms audio latency numbers (assuming that they are credible of course). They make no sense. OK, we are adding software mixing, so we need some extra buffering in the pipeline. But why the latency is getting five times worse and not just twice? Is it because audio mixing in userspace is broken by design? Wouldn't it be natural to do the mixing in the hard irq handler, which is responsible for swapping dma buffers or something like this?

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      • #13
        Originally posted by phoronix View Post
        Ubuntu Desires Lower Audio Latency For Gaming
        Less talk, more development. The same goes for OpenGL drivers, Wayland etc.

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        • #14
          Originally posted by RealNC View Post
          HW mixing is useless though. It was nice on my 486. That Gravis Ultrasound rocket the boat. But today, mixing can be done on the CPU so easily, it's not worth having it in HW.
          well, for me its perfect . i use pure alsa , no dmix ,no pulse ..which leads to a perfectly working sound system which is easily able to provide low latency and sound from multiple sources !

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          • #15
            when i play the guitar and connect the pickup/mic to my usb soundcard, i can have the distorted/chorused/whatever sound on my headphones with no audible latency using jack and rakarrack. Same goes for playing a midi keyboard with zynaddsubfx or singing/playing along to a real-time-pitch-shifted youtube video. Can someone please tell me in how far the audio latency on linux is inacceptably worse than on other platforms? (ok pulse is crap and jack is a pain to configure, but that has nothing to do with linux in general having a high latency, does it?)

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            • #16
              Originally posted by RealNC View Post
              That results in the game taking exclusive control of the card. Nothing else will be audible. Which is a disaster. Unless you talk to the dmix device. In that case, you're back to high latency.
              The latency in dmix is far less than the latency in Pulse Audio, at a level suitable for gaming. It would be interesting to see actual data on the difference, but one of the first things I do before gaming on Linux is uninstall Pulse and configure dmix. That, and I suppose Wine support for Pulse hasn't been as stable, but I assume that has changed by now.

              Does anyone remember the old KDE aRts sound server, which was a common culprit for broken games due to its latency? Eventually people got sick of it and it was dropped. Pulse has always seemed like the same type of tech to me, but then again Jack doesn't seem to have these problems. Maybe they'll prove me wrong.

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              • #17
                Originally posted by triune View Post
                What's wrong with jack? It's very similar to pulseaudio except that its as close as you can possibly get to raw ALSA latency for as many applications as you can throw at it!
                I have been wondering also. For about ten years.

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                • #18
                  What happened to Jack is that in FOSS, some devs , instead of help to iron out the last remaining major bugs of something just love fork or simply love to me-me-me idea is better than yours and create something more broken than the thing that they are supposed to solve.

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                  • #19
                    Well assuming that these ms times are accurate, PA = *crap performance (most of us knew that). I'm glad I still use ALSA =).

                    *I am not saying PA is crap just it's performance

                    A little off topic rant: Ubuntu uses pulse audio and unity both hit performance (significantly in some cases) then they bitch about low performance?

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                    • #20
                      Will Ubuntu try to improve it for all or only for itself like with any other thing they done.

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