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IDProjectCategoryView StatusLast Update
0005642ardourbugspublic2013-08-17 06:41
Reporterotherone23 Assigned To 
Status newResolutionopen 
Product Version3.0 
Summary0005642: 3.2 and 3.3 produce considerably more xruns
Descriptiontried with a few kernel configs and compiles, a few ardour recompiles, across different machines, with the provided binaries, etc. 3.2 and 3.3 consistantly xrun more, to the point of me sticking with 3.1 until it can be routed out.

with 3.1 i can record at 128/2 for hours and hours and hours without a glitch no matter how i try. 32/2 even just for fun.

3.2 and 3.3 glitch occasionally even at 128.

3.2 and and 3.3 are still usable, but it pains me to see such a step back in performance; 3.1 worked so beautifully, a work of art. please let us don't loose sight of the performance!
TagsNo tags attached.



2013-08-17 02:10

reporter   ~0015272

I've seen this too. I'm up to 512/6 and 69.7ms latency for safety - I can use it at 46ms but anything below that, it becomes a problem. That's up a lot from 3.1.10. I can live with it because I have hardware monitoring, but it's definitely worse. (I'm on USB hardware so my numbers are always going to be problematic, but still. I don't think it's CPU; I'm on a quad-core 3Ghz processor with 4G of ram running at about 20% of cpu utilisation and not swapping at all.)


2013-08-17 06:41

reporter   ~0015273

I think i saw this aswell when going to 3.2 and 3.3 but ill need to test again to confirm since im running 3.0 due to some midi bugs that make it unworkable.

with ardour 3.0 im running 128/3 and get 1 or 2 xruns during a session with several audio files and also several midi tracks with soundfont softsynths and 10 band graphic eq compressors and reverb plugins running.

Cant test recording much as i only have 2 inputs so thats not really that many.

Im also using my crappy onboard sound.

What graphics card are you using, i noticed a significant decrease in gui redraw when going to 3.3 which could be the new shinny graphics in the mixer and bugs in nvidias propriety drivers.

with nividias drivers i have to use there 2 settings

nvidia-settings -a InitialPixmapPlacement=0
nvidia-settings -a AccelerateTrapezoids=0

And that fixes slowdowns when switching between windows.

might be unrelated but it could be causing hicups leading to xruns.

Ill need to load up 3.3 again to test at the begging of next week when i have time.

Issue History

Date Modified Username Field Change
2013-08-08 17:25 otherone23 New Issue
2013-08-17 02:10 solarbird Note Added: 0015272
2013-08-17 06:41 veda_sticks Note Added: 0015273