Update Realtime-Best-Practices.md

Add "Did I mention you should buy more memory?" to 3.5 instead of "Buy more memory! Do it!" Makes it clear that it's intentional.
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@ -490,7 +490,7 @@ Insufficient random access memory (RAM) leads to virtual memory page swapping, w
#### 3.5 Avoid Intel “Efficiency” Cores
Intel "efficiency" cores arent currently recognized by most Linux OSs and will cause a lot of problems. They are more energy efficient, but slower, the opposite of what hard realtime needs. RHEL8 is unable to determine which cores are “E” (Efficiency) and which are “P” (Performance). Buy more memory. Do it!
Intel "efficiency" cores arent currently recognized by most Linux OSs and will cause a lot of problems. They are more energy efficient, but slower, the opposite of what hard realtime needs. RHEL8 is unable to determine which cores are “E” (Efficiency) and which are “P” (Performance). Did I mention you should buy more memory?
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### 4. Network