A lower value raises average throughput by utilizing MTU capacity more efficiently. If the number of packets overwhelms any receiver, try a lower value.To reduce average latency, try raising the value. Select an initial value based on capacity of the receiving CPUs to handle NIC interrupts. ip link add link eth0 name eth0.8 type vlan id 8 adds tagged VID 8 to eth0, creating the eth0.8 subinterface. To begin, try a value within the range 50,000 to 150,000 packets per second. VLAN tagging in Linux is accomplished by using subinterfaces, e.g.The general goal is to determine the highest value that does not overwhelm any receiving hardware. Use these guidelines as you empirically tune this parameter: When an application rapidly sends one small message per send call, then adjust the packet send limit to increase throughput efficiency.However, if slow receivers report dataloss, then consider tuning the packet send limit (see the next item). For best results in most situations, set the packet send limit to zero. When an application sends batches of several messages in its send calls, it is probably already using UDP bandwidth efficiently.(This sending parameter has no effect at the receiving end.) Tune the packet send limit parameter on the senders’ transports.Pla圜ap is a GUI tool for playing back pcap/Wireshark captures (GPL, Linux/Windows). When an inbound packet arrives, the cost of the NIC interrupt is independent of the size of the data in the packet. packETH GUI/CLI Ethernet packet generator (GPL, Linux/OSX/Windows) Packet Sender is an open source utility to allow sending and receiving TCP, UDP, and SSL (encrypted TCP) packets (GPL, Linux/OSX/Windows). Hardware limits on the number of NIC I/O interrupts translate into limits on the receiver’s inbound message rate. It has a powerful packet configuration language, which is rather low. trafgen utilizes the packet (7) socket interface of Linux which postpones complete control over packet data and packet headers into the user space. However, even if the data send rate is low, a high packet send rate can still overwhelm a receiver. trafgen is a fast, zero-copy network traffic generator for debugging, performance evaluation, and fuzz-testing. Limiting the packet send rate also limits the data send rate (bytes per second), because the data send rate varies with the packet rate and the data sizes of the packets. To prevent these scenarios, you can limit the rate at which sending programs transmit UDP packets to the network.Īdministrators can empirically tune the flow of data packets from sending programs by adjusting the packet send limit, which is a required property of UDP-based transports. Upon receiving a UDP packet, I need to respond to the sender with the address he used to send the packet to which Im replying. With UDP-based transports such as multicast, fast sending programs can overwhelm slower receiving programs, which could result in retransmission-related latency, extra resource consumption of CPU cycles and network bandwidth, retransmission storms, or data loss.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |