[Bug 110950] New: preemption issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110950

            Bug ID: 110950
           Summary: preemption issues
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sancelot at numalliance.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi, 
I am facing preemption issues related with rt preempt realtime tasks and  intel
video driver with next chipsets  :

* Intel J1900
* 4300 U

On heavy X11 load (eg lot of widgets creation at application startup, moving
windows, hide/show windows...) my realtime task is interrupted for about 500us
to 1ms.

My realtime task is isolated on a cpu, I suppose the problem is related to
memory access, the driver locks /access memory and my application can't access
it . (There is only a numa node available)


If I run the same graphics applications through a ssh connection the problem
has not happened. 

I would like to know if there are workarounds ? and preemption status with
intel drivers.

Thanks

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