In the our system a video stream is received from Ethernet device.
And then when the all data is already collected picture is displayed.

Can a shared interrupt of the ethernet and graphics controller 
have an impact for application performance:
   io-pkt-v4-hc                 --> irq5,
   io-graphics / io-display --> irq5
?

Or better idea is to separate interrupts for both devices i.e. :
   io-pkt-v4-hc                 --> irq5,
   io-graphics / io-display --> irq10
?