latency test

latency test

[demon.han]

Hi,all
I compile the kernel-4.9.38 with xenomai-3.0.5,then I run latenct test.
I use ubuntu16.04 desktop to do these,however,the latency is sometimes up to 80+ us.
Also, I close lightdm and enter none-desk to run latency again,it's perfect that the latency is under 15us.
But I want the desktop with small latency,anyone has ideas for me?
BestWishes,
demon.



demon.han@aliyun.com

Re: latency test

[Alec Ari]

Firefox bumps latency up too, I wonder if the Xenomai pros have any advice on this. Good question! It'd be nice to do video editing and 4K encoding while doing real-time processes too.


Alec

Re: latency test

[Bart Vissers]

I've done some testing with the X-window suggestions at:
https://gitlab.denx.de/Xenomai/xenomai/wikis/Troubleshooting#the_latency_test_shows_high_latencies

My results on an Intel PC with Xenomai 3.0.7, Linux 4.9, Debian 9.7 with
xfce4, worst-case latencies:
- Using Intel driver: 39.8 us
- Using fbdev, 34.8 us
- Setting Option "NoAccel", both with Intel and fbdev driver: 22.6 us
- No GUI:  6.3 us

So setting "NoAccel" helps in my case, but I'm also looking forward to
further improve it.

Bart

On Thu, 28 Mar 2019 at 07:29, Alec Ari via Xenomai <xenomai@xenomai.org>
wrote:

> Firefox bumps latency up too, I wonder if the Xenomai pros have any advice
> on this. Good question! It'd be nice to do video editing and 4K encoding
> while doing real-time processes too.
>
>
> Alec
>
>