Reservations are not limits, they are minimum guaranteed CPU usage constraints. while theoretically, those are minimum guaranteed resources, if there are other

Reservations are not limits, they are minimum guaranteed CPU usage constraints. while theoretically, those are minimum guaranteed resources, if there are other busy containers running on the host, you will still see your tail latencies and average latency increasing abnormally imagine you got 4 core ec2 instance, the latencies you see at 50% cpu utilisation and 90% cpu utilisation are quite different. with reservations similar thing happens i.e even though each container is guaranteed to their reservations, the relative CPU utilisation still increased very high when there are other busy processes on the same host