Identifying a local congestion control algorithm of a virtual machine

A computer usable program product comprising a computer readable storage device including computer usable code, the computer usable code when executed by a processor causing a set of operations to be performed, the set of operations comprising:

• receiving, at an application executing in conjunction with a virtual switch (vSwitch) in a host system, using a processor assigned to the vSwitch in the host system, a flow of a number of packets from a virtual machine (VM);
• computing, at the application, a set of congestion window values (CWND values) using a corresponding set of congestion control algorithms;
• determining, at the application, whether any of the CWND values in the set of CWND values match the number of packets in the flow within a tolerance value;
• concluding, responsive to a matching CWND value in the set of CWND matching the number of packets in the flow within the tolerance value, that a type of the congestion control algorithm which computed the matching CWND value is the type of a local congestion control algorithm implemented within the VM;
• and
• coordinating at the vSwitch, without the VM knowing about the coordinating, a datacenter-level congestion control with the type of the local congestion control algorithm at the VM.

A data processing system comprising:

• a storage device, wherein the storage device stores computer usable program code;
• and
• a processor, wherein the processor executes the computer usable program code, and wherein the computer usable program code when executed by the processor causing a set of operations to be performed, the set of operations comprises:
• receiving, at an application executing in conjunction with a virtual switch (vSwitch) in a host system, using a processor assigned to the vSwitch in the host system, a flow of a number of packets from a virtual machine (VM);
• computing, at the application, a set of congestion window values (CWND values) using a corresponding set of congestion control algorithms;
• determining, at the application, whether any of the CWND values in the set of CWND values match the number of packets in the flow within a tolerance value;
• concluding, responsive to a matching CWND value in the set of CWND matching the number of packets in the flow within the tolerance value, that a type of the congestion control algorithm which computed the matching CWND value is the type of a local congestion control algorithm implemented within the VM;
• and
• coordinating at the vSwitch, without the VM knowing about the coordinating, a datacenter-level congestion control with the type of the local congestion control algorithm at the VM.