[dpdk-dev] Performance impact of "declaring" more CPU cores

David Christensen drc at linux.vnet.ibm.com
Fri Oct 25 19:35:50 CEST 2019


> The only useful observation we made is that when we are in a "bad case", 
> the LLC has more cache misses.

Have you looked closely at the CPU topology on your platform, can you 
provide some examples here of what you're seeing?  The hwloc package is 
very useful in visualizing how your logical cores map to CPU cache. 
There may be benefit is more strategically selecting the lcores you use 
to reduce LLC cache mssies.

Dave


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