Hi Sven;

I'm not saying you are wrong;  and I thank you for posting the results of your 
testing.

> 
> And today I did.
> Running 2x2 GB RAM to maximize the I/O. Latency test, one glxgears and a
> Firefox to linuxcnc resulted in 15 849. Turned the graphics resolution down
> to 1024x768 and I was able to keep it a bit lower, But only a bit as I
> passed 14 000 for the same test. I still don't believe in you guys saying
> that a D525MW is able to stay below 10 000 in a latency test.

I don't think you changed the graphics driver just by lowering the latency.  I 
have not done much Linux stuff in years, but I'm wondering what X graphics 
driver you are using? Can you force the graphics driver into some VGA totally 
software render mode? 

Also remote into it, and run it as a headless station. I should do this and see 
how it performs. Maybe next time I have a few hours around the house (hah! not 
in the next few weeks…) I'll run that test.

> One thing though, I filled one of the boards with 8 GB RAM (2x4). That
> board is running 64 bit Ubuntu in the office and it happily reported 8 GB
> even though the hardware spec says max 4 GB. It seems that 4 GB is a soft
> limit.


Running a 32 bit kernel? I don't think you'll be able to address over 4g via 
sw.  Maybe they expect people to run windows, not Linux!

Interesting that you can put the RAM in, as like you, I had assumed that it was 
not just a SW limit.

Thanks;

John A. Stewart.
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