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For example, if a file is transferred, the goodput that the user experiences corresponds to the file size in bits divided by the file transfer time. The goodput is always lower than the throughput (the gross bit rate that is transferred physically), which generally is lower than network access
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are further limited to 1448 bytes as they also carry a 12-byte time stamp). The data is transmitted over
Ethernet in a frame, which imposes a 26 byte overhead per packet. Given these overheads, the maximum
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bits as well as retransmitted data packets. This is related to the amount of time from the first bit of the first packet sent (or delivered) until the last bit of the last packet is delivered.
208:(a minimum of 96 bit times), or collisions (which have a variable impact, depending on the network load). TCP adds the overhead of acknowledgements (which along with the
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Inter-packet time gaps caused by packet generation processing time (a source that does not use the full network capacity), or by protocol timing (for example
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The goodput is a ratio between delivered amount of information, and the total delivery time. This delivery time includes:
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in congested switches and routers, is included in the datalink layer or network layer throughput but not in the goodput.
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Over
Ethernet files are broken down into individual chunks for transmission. These chunks are no larger than the
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delivered by the network to a certain destination per unit of time. The amount of data considered excludes
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Packet retransmission time (in case of deleted packets in congested routers, or detected bit errors)
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318:"TCP Performance problems caused by interaction between Nagle's Algorithm and Delayed ACK"
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Energy-Efficient Power and Rate
Control with QoS Constraints: A Game-Theoretic Approach
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144:: For example, TCP slow start may cause a lower goodput than the maximum throughput.
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Note that this example doesn't consider additional
Ethernet overhead, such as the
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and the TCP window size in effect rate-limit each individual TCP connection, see
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throughput of a communication; i.e. the number of useful information
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Examples of factors that cause lower goodput than throughput are:
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header information, leaving 1460 bytes per packet for file data (
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Retransmission of lost or corrupt packets due to transport layer
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RFC 2647 — Benchmarking
Terminology for Firewall Performance
197:which is 95.67 megabits per second or 11.959
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249:(distance divided by wave propagation speed)
273:Delayed acknowledge due to flow control,
69:Learn how and when to remove this message
32:This article includes a list of general
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176:header information and 20 bytes of
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266:store-and-forward processing delay
38:it lacks sufficient corresponding
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168:of IP over Ethernet, or 1500
291:Measuring network throughput
16:Application level throughput
239:(amount of data divided by
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166:maximum transmission unit
149:automatic repeat request
214:bandwidth-delay product
53:more precise citations.
113:connection speed (the
81:In computer networks,
210:round-trip delay time
275:congestion avoidance
199:megabytes per second
141:congestion avoidance
373:Network performance
341:Goodput calculation
297:spectral efficiency
230:collision avoidance
193:is 1460/1526 × 100
346:2010-08-18 at the
264:Intermediate node
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235:Data and overhead
220:Data delivery time
316:Stuart Cheshire.
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247:Propagation delay
129:Protocol overhead
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321:. Retrieved
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51:introducing
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303:References
95:throughput
59:April 2016
34:references
119:bandwidth
97:) is the
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344:Archived
285:See also
241:bit rate
335:Sources
252:Packet
191:goodput
160:Example
83:goodput
47:improve
195:Mbit/s
36:, but
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