Re: Why X11 influences the latency of xenomai?

Jan Kiszka jan.kiszka at siemens.com
Wed Apr 8 18:41:04 CEST 2020


On 08.04.20 15:13, 孙世龙 wrote:
> Hi,
>        I could not catch your idea about the GPU usage patterns. How 
> could I acquire this information?
>        My laptop model is Dell Latitude 5501 runing over ubuntu 14.04 
> system.
>        GPU model information: NVIDIA GeForce MX150.
> 

NVIDIA... using their close-source driver or nouveau?

It's been a long time I ran that on a Xenomai box, I only vaguely 
remember that there used to be issues with lengthy cache flushes when 
data is pushed to RAM in order to make it visible to the GPU.

Jan

>       Best regards.
> 
> Jan Kiszka <jan.kiszka at siemens.com <mailto:jan.kiszka at siemens.com>> 于 
> 2020年4月8日周三 下午5:05写道:
> 
>     On 08.04.20 10:39, 孙世龙 via Xenomai wrote:
>      > Hi,
>      >      Why X11 influences the latency of xenomai?I guess it has
>     some relation
>      > to GPU.Could you make me more clearly?
>      >      I have solved the latency . I am using QT runing on linux
>     framebuffer
>      > ,disabled X11 at all.I really hope to why  X11 influences the
>     latency of
>      > xenomai
> 
>     It's not X11, it's the side effects of certain GPU usage patterns on
>     your particular platform. Can you specify more details about both?
> 
>     Jan
> 
>     -- 
>     Siemens AG, Corporate Technology, CT RDA IOT SES-DE
>     Corporate Competence Center Embedded Linux
> 


-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux



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