Abstract: Embodiments relate to creating a coherent load or congestion map that displays the simultaneous activity of all queues of physical and virtual switches and adapters in a network without forcing clock synchronization. An aspect includes sampling, by a central processing device, a status of all queues in a plurality of elements in a network. The sampled data flows are received from the plurality of elements in the network and an image is created of the network. The image includes the status of all sampled queues in the plurality of elements at a point in time. Accordingly, a load map is created without synchronizing clocks of the plurality of elements. The load map is assembled using segments of the image of the network.

Abstract: A virtual network is implemented on a physical network. A virtual network data packet is tunneled through the physical network via encapsulation within a physical network data packet and via transmission of the physical network data packet through the physical network. A network congestion notification capability of the virtual network is preserved and modified during transmission of virtual network data through the physical network and vice-versa. Congestion notification metadata can be copied from a header of a virtual network data packet to a header of a physical network data packet when the virtual network data packet is encapsulated into the physical network data packet. Congestion notification metadata can be copied from a header of a physical network data packet to a header of a virtual network data packet when the virtual network data packet is decapsulated from the physical network data packet.

Abstract: Congestion management for data traffic in a virtual domain identifies a congestion source and sends a message to the source to adjust data traffic rates. The source may be a virtual machine hosted by a physical server with one or more virtual servers incorporated. A congestion manager may identify the source and send the message to the source without affecting other data sources hosted by the physical server or the virtual servers. In some embodiments, information about the congestion source may be encapsulated in a packet payload readable only by the congestion source so only the congestion source receives the instruction to adjust the transmission rate.

Abstract: Congestion management for data traffic in a virtual domain identifies a congestion source and sends a message to the source to adjust data traffic rates. The source may be a virtual machine hosted by a physical server with one or more virtual servers incorporated. A congestion manager may identify the source and send the message to the source without affecting other data sources hosted by the physical server or the virtual servers. In some embodiments, information about the congestion source may be encapsulated in a packet payload readable only by the congestion source so only the congestion source receives the instruction to adjust the transmission rate.

Abstract: A virtual network is implemented on a physical network. A virtual network data packet is tunneled through the physical network via encapsulation within a physical network data packet and via transmission of the physical network data packet through the physical network. A network congestion notification capability of the virtual network is preserved and modified during transmission of virtual network data through the physical network and vice-versa. Congestion notification metadata can be copied from a header of a virtual network data packet to a header of a physical network data packet when the virtual network data packet is encapsulated into the physical network data packet. Congestion notification metadata can be copied from a header of a physical network data packet to a header of a virtual network data packet when the virtual network data packet is decapsulated from the physical network data packet.

Abstract: According to one embodiment, a method for handling congestion in a network includes determining that there is congestion on a first device in a network, setting a congestion indicator in a header of a packet to indicate an amount of congestion at the first device, sending the packet to all devices that send traffic to the first device, receiving the packet having the multi-bit indicator in a header thereof at a device that sends traffic to the first device, and reducing a congestion window by a factor of between about 5% and about 50% based on a severity of the congestion indicated by the multi-bit indicator, wherein the congestion window is reduced by a greater factor when the congestion is indicated as being more severe. Other systems and methods for handling congestion in a network are described according to more embodiments.

Abstract: In an exemplary embodiment, a computer-implemented method includes receiving a plurality of load data related to a plurality of physical machines in a computing environment. The plurality of load data is converted to a plurality of data points, each data point representing a corresponding physical machine from among the physical machines. A graph is generated, by a computer processor, of the plurality of data points representing the plurality of physical machines. A misbehavior alert is output for each of the physical machines that falls outside a predetermined safe range in the graph.

Abstract: In one embodiment, a system includes a hardware processor and logic integrated with and/or executable by the processor, the logic being adapted to receive a traffic flow having a plurality of packets, classify the traffic flow into a traffic class based on a characteristic of the traffic flow, the traffic class being selected from a plurality of traffic classes, store an identifier of the selected traffic class to one or more of the packets, and transmit the traffic flow according to its destination based on a priority of its selected traffic class. In more embodiments, additional systems, methods, and computer program products for prioritizing traffic flow handling are described.

Abstract: Congestion management for data traffic in a virtual domain identifies a congestion source and sends a message to the source to adjust data traffic rates. The source may be a virtual machine hosted by a physical server with one or more virtual servers incorporated. A congestion manager may identify the source and send the message to the source without affecting other data sources hosted by the physical server or the virtual servers. In some embodiments, information about the congestion source may be encapsulated in a packet payload readable only by the congestion source so only the congestion source receives the instruction to adjust the transmission rate.

Abstract: Embodiments relate to creating a coherent load or congestion map that displays the simultaneous activity of all queues of physical and virtual switches and adapters in a network without forcing clock synchronization. An aspect includes sampling, by a central processing device, a status of all queues in a plurality of elements in a network. The sampled data flows are received from the plurality of elements in the network and an image is created of the network. The image includes the status of all sampled queues in the plurality of elements at a point in time. Accordingly, a load map is created without synchronizing clocks of the plurality of elements. The load map is assembled using segments of the image of the network.

Abstract: Flow control of data packets in a network may be enabled to at least one side of a virtual switching interface to provide a lossless environment. In some embodiments, wherever two buffer queues are in communication with at least one buffer queue being connected to a virtual switching interface, flow control may be used to determine if a threshold has been exceeded in one of the buffer queues. When exceeded, the transmission of data packets may cease to one of the buffer queues to prevent packet dropping and loss of data.

Abstract: The sizing of virtual machines is optimized based on projected performance metrics. All virtual machine configuration resources are normalized by a processing device. The normalized resources for the virtual machine configurations are then stored in a catalogue. An application is then profiled to obtain resource demand estimates for each virtual machine configuration and a base performance is calculated for the application. The base performance is used to predict performance estimates on all virtual machine configurations in the catalogue. Accordingly, a virtual machine configuration having a lowest response time is selected.

Abstract: A virtual network is implemented on a physical network. A virtual network data packet is tunneled through the physical network via encapsulation within a physical network data packet and via transmission of the physical network data packet through the physical network. A network congestion notification capability of the virtual network is preserved and modified during transmission of virtual network data through the physical network and vice-versa. Congestion notification metadata can be copied from a header of a virtual network data packet to a header of a physical network data packet when the virtual network data packet is encapsulated into the physical network data packet. Congestion notification metadata can be copied from a header of a physical network data packet to a header of a virtual network data packet when the virtual network data packet is decapsulated from the physical network data packet.

Abstract: A virtual network is implemented on a physical network. A virtual network data packet is tunneled through the physical network via encapsulation within a physical network data packet and via transmission of the physical network data packet through the physical network. A network congestion notification capability of the virtual network is preserved and modified during transmission of virtual network data through the physical network and vice-versa. Congestion notification metadata can be copied from a header of a virtual network data packet to a header of a physical network data packet when the virtual network data packet is encapsulated into the physical network data packet. Congestion notification metadata can be copied from a header of a physical network data packet to a header of a virtual network data packet when the virtual network data packet is decapsulated from the physical network data packet.