[LAD] cpu spikes

Fokke de Jong fokkedejong at gmail.com
Mon Feb 8 10:07:16 UTC 2016

Hi all, 

I just wanted to give you an update on my quest for super-low-latency.
I bit the bullet and compiled a rt-kernel.
And the result is super-stable audio with a period of 32 samples @48Khz (for a total roundtrip latency of 3.5ms).
With a (peak)  cpu load hovering around 70% on all 4 cores I don’t get any xruns anymore. (even when running a bloated desktop that comes with mint :-)

I only tested it running for a few minutes, we’ll see what happens when running for a few hours, but I’m happy so far.
My conclusion is that the lowlatency kernel is nice for lowish latency with a load that isn’t too high, but it just doesn’t cut it for high demanding work.

I want to thank you all for your input, I have learned a lot.


> IOW for detailed help the output of commands might be needed, depending
> to what is unclear the it could be the output of lsusb,
> cat /proc/interrupts, rtirq status, cat /proc/asound/cards,
> tree /sys/bus/usb/drivers/usb/ etc..
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