Hi gem5 community, I am exploring the arbitration in between the LLC queues in Ruby Memory Model. Version: 22.0.0.2 CPU target: x86 Memory model: Ruby Configuration: 8 cores num of LLC slices: 8 Therein, I experience FIFO ordering violations. Error message: build/X86/mem/ruby/network/MessageBuffer.cc:268: panic: FIFO ordering violated: [MessageBuffer: consumer-yes [ 0x557c3d7637b0 ]] board.cache_hierarchy.ruby_system.l1_controllers6.bufferFromL1 name: board.cache_hierarchy.ruby_system.l1_controllers6.bufferFromL1 current time: 21962530736748 delta: 333 arrival_time: 21962530737081 last arrival_time: 21962530737414 Looking at it, it appears that in the L1 controller's Message queue enqueue, if we see that the queue was blocked, we add a latency by delta. Now in the next iteration, it experiences current time is less than last arrival time and it panics out. Is there any comment on how to take care of this? I do see that there is an option of randomization in the queue but that I wanted to avoid. Thanks and regards, Dinesh