Limiting backpressure with bad actors
View Patent ↗In an embodiment, a method includes, in response to detecting available memory of a destination node of a packet flow of nodes to the destination node being below a particular threshold, marking the destination node as being in a backpressure state. The destination node, in the backpressure state, sends a signal indicating a condition of packet backpressure to the nodes of the packet flow, and initiates a timer for a particular time period. The method further marks, at the end of the particular time period, the destination node as being in a bad actor state if the available memory is below the particular threshold, and as being in a good actor state if the memory is above the particular threshold. The method, in response to marking the destination node as being in a bad actor state, sends a signal to the nodes causing the nodes to drop packets directed to the destination node.
1. A method comprising:
in response to detecting available memory of a destination node of a packet flow of one or more nodes to the destination node being below a particular threshold, marking the destination node as being in a backpressure state, wherein the destination node in the backpressure state sends a first signal indicating a condition of packet backpressure to the one or more nodes of the packet flow, and initiating a timer for a particular time period;
marking, at the end of the particular time period, the destination node as being in a bad actor state if the available memory is below the particular threshold, and as being in a good actor state if the memory is above the particular threshold, and
in response to marking the destination node as being in a bad actor state, sending a second signal to the one or more nodes of the packet flow causing the one or more nodes to drop packets directed to the destination node.
2. The method of claim 1 , further comprising:
in response to marking the destination node as being in a good actor state, sending a third signal to the one or more nodes of the packet flow causing the one or more nodes to continue sending packets to the destination node.
3. The method of claim 1 , wherein marking the destination node as being in the bad actor state further includes throwing an interrupt to other entities related to the packet flow.
4. The method of claim 1 , wherein the destination node is a virtual function (VF) ring.
5. The method of claim 1 , wherein the threshold is a watermark.
6. The method of claim 1 , further comprising:
at startup, initiating the destination node as being in the bad actor state.
7. The method of claim 1 , wherein sending the signal further includes sending the second signal to the one or more nodes of the packet flow indicating the destination node is not accepting new packets.
8. A system comprising:
a processor configured to:
in response to detecting available memory of a destination node of a packet flow of one or more nodes to the destination node being below a particular threshold, mark the destination node as being in a backpressure state, wherein the destination node in the backpressure state sends a first signal indicating a condition of packet backpressure to the one or more nodes of the packet flow, and initiating a timer for a particular time period;
mark, at the end of the particular time period, the destination node as being in a bad actor state if the available memory is below the particular threshold, and as being in a good actor state if the memory is above the particular threshold, and
in response to marking the destination node as being in a bad actor state, send a second signal to the one or more nodes of the packet flow causing the one or more nodes to drop packets directed to the destination node.
9. The system of claim 8 , wherein the processor is further configured to, in response to marking the destination node as being in a good actor state, sending a signal to the one or more nodes of the packet flow causing the one or more nodes to continue third sending packets to the destination node.
10. The system of claim 8 , wherein marking the destination node as being in the bad actor state further includes throwing an interrupt to other entities related to the packet flow.
11. The system of claim 8 , wherein the destination node is a virtual function (VF) ring.
12. The system of claim 8 , wherein the threshold is a watermark.
13. The system of claim 8 , further comprising:
at startup, initiating the destination node as being in the bad actor state.
14. The system of claim 8 , wherein sending the second signal includes sending the second signal to the one or more nodes of the packet flow indicating the destination node is not accepting new packets.