performance - GPU affects core calculation and or RAM access (high jitter)? -


i have kthread runs alone on 1 core multi-core cpu. kthread disables irqs core, runs loop fast possible , measures maximum loop duration of tsc. whole acpi stuff disabled (no frequency scaling, no power saving, etc.).

my problem is, maximum loop duration apparently depends on gpu.

  1. when system used normal (a little bit office, internet , programming stuff / not busy) maximum loop duration around 5 :-(
  2. the same situation, stressed cpu (the other 3 cores 100% busy) leads maximum loop duration of approximately 1 :-|
  3. but when gpu switching idle mode (turning-off screen), maximum loop duration going down less 300 ns :-)

why that? , how can influence behavior? thought cpu , ram directly connected. recognized, maximum loop duration becomes better on system external graphic card first situation. second , third case couldn't see difference. tested amd , intel systems without success - same :-(

i'm fine second case. possible achieve without stressing cpu additionally?

many in advance!

billy


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