HumanMedia;678603 Wrote: > Observations on the process priorities we are configuring in the tt > file. > > For me, after editing the changes into the tt file, saving and > rebooting: > 1. Setting the watchdog priority to 0 in the file (PRIOWATCHDOG=0) does > nothing and the priority remains 99 (setting it to 1 works tho) > 2. Same with setting PRIOIRQ37=0, IRQ remains with a priority of 40 > after restart regardless (setting it to 1 works tho) > 3. pdflush 154 & 155 - why is my sound better if I set these to zero? > maybe flushing the cache as fast as possible isn't optimal? > > Thoughts > FYI my goals are to get the music through with the least amount of > interference by the SBT. > What Im worried about is that these tweaks are being guided to > compensate for tonal imbalances elsewhere our systems, by adding energy > (most likely jitter, power supply noise or distortion of the digital > waveform) which affects parts of the frequency range downstream. IMO > these process values should be all about reducing these aspects first > not unwittingly making them worse for quick tonal changes. > > All of these current tweaks are also based around the TT3 default core > process priorities. Im wondering if there could be a far better 'chord' > of base process priorities to tweak around? > Also wondering if the base set of process priorities can be determined > from a scope waveform to get the cleanest digital signal first, with > the least jitter and waveform skew, to determine the baseline - then > fine tune by ear? > > And what specific settings can be agreed on by all? - it appears that > shutting down all unused processes has a positive effect for all? and > its just the priority relationship between the essential processes that > needs to be explored? > > And which are the absolutely non-essential processes for the optimal > SBT audio file/stream playback? > And then are some processes non-essential for playback, but equate to a > better signal and sound if they actually are running (watchdog)?
1. chrt -o -p 0 13 required, I get more detail. 2. this was the first setting I set to 0, it is the usb process, again require chrt -o -p 0 ??, made a difference to me and this started the whole priority setting mods. 3. pdflush at 0 on my system is not as detailed or revealing as at fifo 98, I am judging that this is a good thing as it produces outrageous levels of detail in my system. the effect of this is that compressed cd sources, modern cds that are engineered loud and bad recordings really sound bad, while good airy cds and hirez make it sound like the musicians are in the same room. anyway this is a toolkit and you can have super revealing and forward sound or something more relaxed, less detail and more tolerant of different quality of sources, I prefer the former. here are the differences I get buffer - how revealing do you want the sound ? 3200 most revealing pdflush - how forward and detailed do you want the sound ? 98 ok for me, 99 too much irq14 and irq47 - what balance do you want between bass, mid and top, found 39 for both ok for me, higher equals more bias towards bass. tried setting watchdog to fifo 30, but this gave a smoother less detailed sound, not convinced, Soundcheck also recommended setting it to 0 - not sure if he still advises it. my system tends towards a lean sound thanks to the dac, but is already very dynamic, so rather than adding energy I would suspect that on less resolving systems the sound may sound flat. all hi fi is about compromise and each component has its own influence. my aim was to get as neutral and detailed, but listenable sound as possible. not sure how jitter can be introduced with these settings ass that is a function of SBT hardware. hope this helps -- SBGK ------------------------------------------------------------------------ SBGK's Profile: http://forums.slimdevices.com/member.php?userid=52003 View this thread: http://forums.slimdevices.com/showthread.php?t=91322 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
