Re: Why X11 influences the latency of xenomai?

孙世龙 sunshilong369 at gmail.com
Sat Apr 11 06:08:32 CEST 2020


Hi,
    I am using nouveau.The related log is listed below.
    GPU model is NVIDIA GeForce GT 650M which was manufactured 9 years
ago.I also do the same test on NVIDIA GK107M which was mentioned in last
letter.
    Sombody claims that they have killed the latency by using nouveau.
    While I using X11 on my laptop, the latency is still a problem.I have
modified the config file for X11 following the guideline on the xenomai
wifi.

Best regards.

sun at sun-Lenovo-IdeaPad-Y480:~$ lspci -nnk | grep -iA2 vga
00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core
processor Graphics Controller [8086:0166] (rev 09)
Subsystem: Lenovo 3rd Gen Core processor Graphics Controller [17aa:3977]
Kernel driver in use: i915
--
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK107M
[GeForce GT 650M] [10de:0fd1] (rev a1)
Subsystem: Lenovo GK107M [GeForce GT 650M] [17aa:3977]
Kernel driver in use: nouveau
sun at sun-Lenovo-IdeaPad-Y480:~$


joy at joy-Lenovo-IdeaPad-Y480:~$ lspci -nnk | grep -iA2 vga
00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core
processor Graphics Controller [8086:0166] (rev 09)
Subsystem: Lenovo 3rd Gen Core processor Graphics Controller [17aa:3977]
Kernel driver in use: i915
--
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK107M
[GeForce GT 650M] [10de:0fd1] (rev a1)
Subsystem: Lenovo GK107M [GeForce GT 650M] [17aa:3977]
Kernel driver in use: nouveau
joy at joy-Lenovo-IdeaPad-Y480:~$

Jan Kiszka <jan.kiszka at siemens.com> 于2020年4月9日周四 上午12:41写道:

> 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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