test I/O-latency during different loads and on different low-latency

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khaldrogo
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test I/O-latency during different loads and on different low-latency

Post by khaldrogo »

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Empty the dirt cup

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Clean the filter

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Clean the brush roll

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Clean the soft roller

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Check the nozzles

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Final Words

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Last edited by khaldrogo on Mon Jul 03, 2023 7:58 am, edited 4 times in total.
Jaaxx
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Re: test I/O-latency during different loads and on different low-latency

Post by Jaaxx »

I have always used this, but it's been a few years since I felt the need. https://www.systutorials.com/docs/linux ... k_iodelay/

Basically -
1- Run it in a terminal
2 - Connect the inputs and outputs of iodelay to one of your interfaces inputs and outputs
3 - Run a physical wire from that output on your interface to the input on your interface
4 - Look at the terminal window to see a running log of latency measurements.
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Re: test I/O-latency during different loads and on different low-latency

Post by merlyn »

When you see 'latency' discussed on the internet it can be a bit confusing because the term can have different meanings in different contexts. There is also what I think is a general misunderstanding about latency that originates in the Windows world. It's the idea that low latency is something you can buy. The idea that interface A has a lower latency than interface B and if you just spend enough money you will get low latency.

I haven't found that to be true.
khaldrogo wrote: I've read a lot on this forum about latency results and different kernel options.
First of all -- a definition of latency. What's relevant to a musician is perceived latency. Latency is only a problem if you hear it. If you want to play a guitar through the computer or play a soft synth live you want the notes to come out when you hit them, not 100 milliseconds later. To achieve a low latency we need to use a small buffer e.g. 32 or 64 samples. You will see the time corresponding to one buffer quoted as the latency but it's not. The length of time corresponding to one buffer is :

(buffer size)/(sample rate)

so the time corresponding to a 48 frame buffer at 48kHz is 1ms. The computer has 1ms to calculate the values of 48 samples (or 96 in stereo, one for left, one for right).

What's relevant to a musician is the round trip latency -- how long does it take for my guitar to go through the computer?

twang > hardware latency > input buffer > DSP > output buffer > hardware latency > processed twang coming out speakers

At a given buffer size the round trip latency will be the same no matter what kernel you use and you can measure round trip latency using jack_iodelay as Jaaxx posted above. Using a different kernel addresses the issue of when xruns appear. You may find that when using a stock kernel your audio software will start with a small buffer but the output is an unusable stream of pops and clicks caused by buffer under- or over-runs collectively called xruns. This is where using different kernels can have a benefit -- not that they've reduced the latency but that they produce an xrun free output at a low latency.
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Re: test I/O-latency during different loads and on different low-latency

Post by sadko4u »

khaldrogo wrote: Mon Mar 22, 2021 4:09 am Hi everyone,

I've read a lot on this forum about latency results and different kernel options. However, I haven't been able to find any good software to test my I/O-latency during different loads and on different low-latency kernels. I was wondering if anyone had any good and hopefully free programs I could download to test my latency.

Thanks!
Try LSP Latency Meter.
LSP (Linux Studio Plugins) Developer and Maintainer.
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