[yocto] [meta-intel] "Crazy" Xorg memory usage after upgrading from Daisy to Fido

[Paul Eggleton]

Rebecca, is this something you or one of your colleagues would be able to help 
with?

Thanks,
Paul

On Friday 05 June 2015 08:29:00 Chris Tapp wrote:
> I’ve got an application that I’ve had running nicely under Daisy for some
> time. As Daisy is now a bit old, I decided to move the application to Fido.
> I’m using the meta-intel/isg/valleyisland BSP and also switched to using
> its Fido branch.
> 
> The move only required a few minor changes and allowed me to drop a Daisy
> “updates” layer that I had been using for things like gstreamer-1.0.
> 
> However, there is one behaviour which is killing me - I keep getting
> oom-killer events!
> 
> The application is basically an OpenGL-ES 2.0 application that renders
> various bits of text, images and streams captured from a gstreamer pipeline
> at 60 Hz to a 1080 screen.
> 
> Under Daisy this generally took just under 50% CPU and used a modest
> percentage of the 4 GB system memory - i.e. no where near running out and
> usage was just about static.
> 
> Under Fido the CPU usage is about the same and the memory used by the
> application itself looks reasonable when compared to Daisy (and usage is
> static). However, the memory used by XOrg is far from constant or stable -
> it basically has a VSZ value cycling from about 630m to 2989m with the
> cycle period being in the order of 5 to 10 seconds. Peaks in XOrg memory
> usage coincide with stutters in video playback within my app (audio is
> unaffected).
> 
> Monitoring /proc/meminfo when this is going on shows that “Shmem” usage is
> following the same pattern as the memory used by XOrg (i.e. Shmem usage is
> high at the same time). If the values are plotted on a graph they appear to
> show that Shmem usage grows linearly and then falls rapidly when nearly all
> the free memory has been exhausted, perhaps in response to a delayed
> garbage collection run.
> 
> Does anyone have any ideas as to what I should be looking at to work out
> what’s going on?
> 
> Are there any significant changes between XOrg under Daisy and Fido that
> could be causing this?
> 
> Could this be related to the meta-intel video drivers?
> 
> Any feedback / comments would be really appreciated.
> 
> Thanks :-)
> 
> --
> 
> Chris Tapp
> opensource at keylevel.com
> www.keylevel.com
> 
> ----
> You can tell you're getting older when your car insurance gets real cheap!

-- 

Paul Eggleton
Intel Open Source Technology Centre