On 7/11/2023 12:37 PM, John Smith via gem5-users wrote:
Hi everyone,
Could someone please help me with explaining what's happening in the below code snippet? It's the
receiveAtomicLogic() function in mem_ctrl.cc. Why are we returning the latency as 0 if the packet
doesn't have any data? And in what case will the packet have/not have data?
// do the actual memory access and turn the packet into a response
mem_intr->access(pkt);
if (pkt->hasData()) {
// this value is not supposed to be accurate, just enough to
// keep things going, mimic a closed page
// also this latency can't be 0
return mem_intr->accessLatency();
}
return 0;
John - Certain packets carry no data. For example, a cache line invalidate
without write back will have that property. Maybe others.
Best - Eliot
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