From: chris.m.thomasson.1@gmail.com   
      
   On 12/28/2025 4:41 PM, BGB wrote:   
   [...]   
      
   Also, if using something like LOCK CMPXCHG you MUST make sure to align   
   and pad your relevant data structures to a l2 cache line.   
      
   Using LL/SC, you need to align and pad them up to a reservation granule.   
   False sharing tends to really nail the LL/SC because it can fail   
   spuriously. Oh the granule was tweaked, lets fail...   
      
   The LOCK CMPXCHG is focusing on value comparison. It's a strong CAS in   
   C++ std.   
      
   The LL/SC if focusing on something else, the granule. It's a weak CAS in   
   C++ std.   
      
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