Furthermore, the throughput of TCP is significantly impacted by packet loss ([3], [4]). The Transmission Control Protocol (TCP) detects packet loss and performs retransmissions to ensure reliable messaging. Note the with default MTUs of 1500, the impact of packet loss is even greater. provide a simple formula that offers insight into the maximum TCP throughput on a single session when there is packet loss. Even a small loss rate can severly impact performance. Packets are pushed to the destination with no regard for packet loss or packet … p 1/2, where d is the link delay and p is the packet-loss probability. We compare traditional TCP Reno, Hamilton TCP (htcp), and throughput predicted by the Mathis equation. Packet loss is measured as a percentage of packets lost with respect to packets sent. ThroughputTCP ˇ p 1:5 MSS RTT p lossrate (1) The MTU was set to 9000bytes. Unstable throughput is typically caused by packet loss. Packet loss in a TCP connection is also used to avoid congestion and thus produces an intentionally reduced throughput for the connection. The effect of packet loss on TCP throughput has been widely analyzed. TCP Network Latency and Throughput Or ‘Why your customer doesn’t receive the Throughput they paid for’ TCP versus UDP Background Traditionally, video was carried over User Datagram Protocol (UDP). Despite the maturity of network links to 10Gbps and beyond, packet loss is still an underlying network event that impacts applications today. 1. Here's a few things you can try to improve the throughput in this situation: Try setting a … When troubleshooting the network there are three metrics used in assessing performance: latency, packet loss, and throughput. Learn about how gauging these metrics will help assess the cause of an unstable and sluggish network in this video. The following formula ([5], [6]) for a simple TCP throughput modeling indicates that its throughput is inversely proportional to both RTT and the square root of loss rate. Yes. If you want to know throughput for some specific traffic, filter it first, then Statistics - Summary, then look in displayed packets. Mahesh, It would actually depend on various factors like Application (TCP vs UDP), window size, latency, packet loss etc . TCP throughput = (TCP Window Size / RTT) Without packet loss (and retransmissions), this is correct. To calculate packet loss, depending on the type of traffic, you can either add up the tcp.retransmission and go from there. TCP is designed to slow down in case packet loss is detected. TCP throughput = BDP / RTT = (Link Speed in Bytes/sec * RTT)/RTT = Link Speed in Bytes/sec This is correct only if the window size is configured to the optimal value. and delay product settings. Network packet loss: are we still coping with that today? If the congestion window decreased when a packet was lost, would it decrease the throughput (speed of the sending of packets from web server)? This way, TCP can detect if a packet goes missing and resend it accordingly, ensuring reliable transmission of data. Does RTO decreases or increases with each packet lost and does it also affect the decrease in the throughput? The Mathis equation states the for TCP Reno, the maximum throughput is bound by this formula: UDP is a connectionless protocol. It will show the throughput for the entire file. Here is a good link on how to calculate the throughput BDP/RTT is the optimal (maximum possible) transfer rate in the network. That formula is: Figure 1: Factors that Impact Throughput. Extreme UDP packet loss at 300Mbit (14%), but TCP > 800Mbit w/o retransmits. Mathis, et al. 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