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	Talk:Latency (engineering) - Wikipedia, the free encyclopedia
		Latency is not just "a measure of amount of time between the start of an action and its completion", it is specifically the amount of time that is unavoidably expended before transmission actually begins.
		Latency in this example is therfore the period taken for a specific point within the transmission (in this example the letter "a" but alternatively any point of the sequence transmitted eg any letter between a and z)to pass Point 1 and be effectively received (in original type state) at Point2.
		Latency is easily percieved during live television interviews with persons on the other side of the globe wher the transmission is relayed by satellite.
	en.wikipedia.org /wiki/Talk:Latency (1250 words)

	Latency (engineering) - Wikipedia, the free encyclopedia
		Latency is a time delay between the moment something is initiated, and the moment one of its effects begins.
		Latency in a packet-switched network is measured either one-way (the time from the source sending a packet to the destination receiving it), or round-trip (the time from the source sending a packet to the source receiving a response).
		The latency of his trip is the time it takes him to go from his house in England to the hotel he is staying at in New York.
	en.wikipedia.org /wiki/Latency_%28engineering%29 (886 words)

	Comparison of latency and bandwidth - Wikipedia, the free encyclopedia
		Bandwidth: how much information can be transferred over a connection in a given period of time.
		Latency and bandwidth together determine the "speed" of a connection, and the "speed" of a connection can vary widely depending on your needs.
		Latency is fairly low (typically about a quarter of a second) and the size of an average web page (around 30-100 kilobytes) will transfer in 10-30 seconds.
	en.wikipedia.org /wiki/Comparison_of_latency_and_bandwidth (591 words)

	Comparison
		Comparison A comparison is an Gregory Bateson in his book Mind and Nature as the two quanta of experience.
		Comparison of C Sharp to Java This is a comparison of the Java programming language.
		Comparison of latency and bandwidth This article is a comparison of latency and bandwidth in latency) connection.
	www.brainyencyclopedia.com /topics/comparison.html (183 words)

	Bandwidth
		Bandwidth Bandwidth is the width, usually measured in Nyquist-Shannon sampling theorem.
		Bandwidth limited pulse A bandwidth limited pulse is a phase across all frequencies making up the pulse.
		Equivalent rectangular bandwidth The equivalent rectangular bandwidth or ERB is a measure used in psychoacoustics.
	www.brainyencyclopedia.com /topics/bandwidth.html (136 words)

	The Effects of Latency, Occupancy, and Bandwidth in Distributed Shared Memory Multiprocessors
		Latency can be hidden by various techniques, all of which exploit the availability of additional bandwidth and require that the processor allows multiple outstanding references.
		We define communication latency as the round-trip latency, assuming no contention, for a remote miss that is satisfied by the main memory of the home node (computed as 2l+4o+6k in Section 2).
		Note that the bandwidth numbers in Table 4.1 are moderate, and in all cases are much less than our node-to-network bandwidth of 400 MB/s (even with burstiness, we find network bandwidth not to be a bottleneck, as mentioned earlier).
	www-flash.stanford.edu /architecture/papers/dsm (9662 words)

	Latency
		Latency Latency is the time a message takes to traverse a system.
		Latency is closely tied to another engineering concept...
		Ring latency may be measured in seconds or in bits at t...
	www.brainyencyclopedia.com /topics/latency.html (82 words)

	Summersault Support Site - Internet Connection Speed Comparison Chart
		Bandwidth is affected by the distance from the network hubs.
		Bandwidth, or capacity, refers to the amount of data a given technology or infrastructure can transmit over time.
		Latency, or "network latency" refers to the speed at which traffic is traveling over an internet connection.
	support.summersault.com /bandwidth_chart.html (675 words)

	Latency vs Bandwidth Definition / Latency vs Bandwidth Research (Site not responding. Last check: 2007-11-04)
		This article is a comparison of latency and bandwidth in telecommunicationsTelecommunication is the extension of communication over a distance.
		A common misunderstanding of communication is that having further bandwidth means a "faster" (lower-latency Latency is the time a message takes to traverse a system.
		Latency measures the amount of time between the start of an action and its completion, whereas throughput is the total number of such actions in a given amount of time....
	www.elresearch.com /Latency_vs_Bandwidth (186 words)

	Unidata - IDD Delays: Latency vs. Bandwidth (fwd)
		Latencies vary widely, so if if the current latency is low but was high during the previous hour, LDM products from an upstream host may still be arriving late because it takes time to catch up with a backlog of products.
		Unfortunately, network latencies are not necessarily symmetric, so running ldmping from a downstream host to an upstream LDM won't always give a good approximation of the network latency in the other direction.
		This RPC latency as measured by ldmping may be the limiting factor for many sites, rather than the volume of the data.
	www.unidata.ucar.edu /content/support/help/MailArchives/idd/msg01789.html (1086 words)

	Comparison of latency and bandwidth (Site not responding. Last check: 2007-11-04)
		Latency is low (typically far less than a second) and the size of an average web page (around 30-100 kilobytes) will transfer in 5-10 seconds or so.
		The postal service has a latency of about 3 days in most cases, but the bandwidth that can be put into a box (in the form of DVD disks) is incredible.
		Although the bandwidth of a satellite connection can be very high and very economical, the latency added by the round trip through the satellite makes low-latency Internet connectivity (AKA ping time) such as network gaming a very bad experience.
	www.portaljuice.com /comparison_of_latency_and_bandwidth.html (563 words)

	Chapter 1 Bandwidth Supply and Demand in Today's Army
		Bandwidth associated with the data link and physical layers (the throughput that is often cited by hardware manufacturers) is called engineering bandwidth; bandwidth at the applications layer is referred to as effective, oroperational, bandwidth.
		Chapter 3 discusses several options for addressing the bandwidth supply/demand gap that exists today and is expected to persist--although at a different point in the command structure--in the future.
		Much of the bandwidth demand reflected in those examples is associated with streaming (continuous) video imaging, which requires a minimum of several megabits per second of throughput to be considered continuous by most viewers.
	www.iwar.org.uk /rma/resources/cbo/chapter1.htm (8341 words)

	Cable vs. DSL: Latency
		Latency is how long it takes a packet to make a round trip on the network (in simplistic terms, a packet is something that carries data across a network).
		Bandwidth is the size of the network connection.
		For me, high latency causes severe productivity problems because when I am connected to a remote server writing code (which is frequently), and I type a character, the character may not appear on the screen for a few seconds.
	jamesthornton.com /writing/cable-vs-dsl-latency.html (567 words)

	Dictionary of Meaning www.mauspfeil.net
		The Mail postal service has a latency of about 3 days in most cases, but the amount of information that can be put into a box (e.g.
		If all Broadcast television system television broadcasts in use were to be transferred over the Internet, the network would buckle immediately as the infrastructure is insufficient by several orders of magnitude to handle the amount of information required.
		There you find a list of all editors and the possibility to edit the original text of the article Comparison of latency and bandwidth.
	www.mauspfeil.net /Comparison_of%20latency%20and%20bandwidth.html (722 words)

	Latency and Bandwidth
		Since clusters of workstations on a network are often used as a virtual parallel machine, it is interesting to compare latency and bandwidths for various local area networks.
		Latency and bandwidth will depend as much on the efficiency of the TCP/IP implementation as on the network interface hardware and media.
		For wide-area networks, latency is usually dominated by distance (speed of light) and is on the order of tens of milliseconds.
	www.netlib.org /utk/papers/latbw/node7.html (498 words)

	Bandwidth
		The bandwidth of SP AM's synchronous stores and gets also converges to 34.3 MBytes/s but at a slower rate due to the round-trip latency as the sender blocks after every transfer waiting for an acknowledgement.
		The effect of this overhead on the bandwidth vanishes as the transfer size increases, explaining the overlapping of both curves for sizes larger than 4 KBytes.
		Figure 3 clearly shows that SP AM's asynchronous transfers are no better than their blocking counterparts for message sizes larger than one chunk (8064 bytes), which is when the flow control kicks in.
	www.cs.cornell.edu /Info/Projects/CAM/sc96/node8.html (390 words)

	Latency and Bandwidth Requirements of Massively Parallel Programs: FFT as a Case Study - Petrini, Vanneschi ...
		Latency and Bandwidth Requirements of Massively Parallel Programs: FFT as a Case Study (1999)
		This paper presents a case study based on the FFT transpose algorithm, which is mapped on two families of scalable interconnection networks, the k-ary n-trees and the k-ary n-cubes.
		Latency and Bandwidth Requirements of Massively Parallel Programs: FFT as a Case Study.
	citeseer.ist.psu.edu /petrini99latency.html (864 words)

	Epinions.com - Know latency from bandwidth, thus know your enemy...
		The ping time, the usual measure of latency, is how fast did the ping packet return from the target machine.
		The smaller the time, the lower latency your connection is. Note that this has nothing to do with bandwidth (i.e.
		Bandwidth is becoming more important as multiplayer games get bigger and bigger, from just 4-8 people to 32 or even 64 people at the same time.
	www.epinions.com /content_7536807556 (897 words)

	Memory Bandwidth vs. Latency Timings - PCStats.com
		With a DDR memory controller now capable of running dual channel, the Pentium 4 was no longer to be bandwidth limited as it had been with the i845 series.
		When one talks about memory timings they're basically talking about how long the system has to wait for the memory to be in a ready state before data is fetched or delivered.
		CAS latency is the delay between the registration of a read command and the availability of the first piece of output data.
	www.pcstats.com /articleview.cfm?articleID=873 (848 words)

	Dunigan's Bulk Transfers Performance
		In the Spring, 2001, the ESnet backbone is ATM/OC3 provisioned as UBR.
		Minimum UDP latency between NERSC and ORNL was measured at 58 ms for an 8 byte datagram.
		We have measured peak bandwidth of 90 Mbs with ftp and ttcp between NERSC and ORNL, but sustained bandwidth is often much less than this.
	www.csm.ornl.gov /~dunigan/netperf/bulk.html (5648 words)

	bps FAQ (Data Speed FAQ)
		I try to normalize everything to the SI standard unit for data rate, bps (bits/second) (should it be b/s ?) and the pseudo-standard Mbps (which sometimes mean 1 000 000 bps but other times 1 048 576 bps).
		Typical bandwidths of modern video cards in a pentium type system could be...
		This bandwidth however must be shared between display refresh, host access, and graphics controller memory operations (bitblt, etc).
	www.rdrop.com /~cary/html/bps_faq.html (2776 words)

	Comparison of latency and bandwidth (Site not responding. Last check: 2007-11-04)
		To view a web page over a 56 kb/s modem (56 000 bits per second) from a server 3 000 miles away is done very effectively over the Internet.
		To download a 5 GB DVD over this 1.5 Mb/s connection would take at least 55 hours, or 2.3 days.
		At a typical monthly cost of $500 per line, you'd be investing $32 500 per month to transfer DVD disks at a comparable rate.
	www.sciencedaily.com /encyclopedia/comparison_of_latency_and_bandwidth (622 words)

	Tom's Hardware Guide Motherboards & RAM: DRAM Performance: Latency vs. Bandwidth - CPUs Need Latency - Caches Want ... (Site not responding. Last check: 2007-11-04)
		The period that the CPU must wait for the "demand word" is known as latency.
		DRAM latency may be measured in nanoseconds, and can dynamically vary from under 40ns to over 100ns depending on many different factors.
		Latency may also be measured in terms of external CPU bus clocks, but in order to understand the CPU performance impact of latency, it must be evaluated in terms of core CPU clocks.
	www.tomshardware.com /motherboard/19980710/dram-01.html (1027 words)

	Case Study One (Site not responding. Last check: 2007-11-04)
		Geoff Huston states in his article “It’s Latency” (http://ispcolumn.isoc.org) that on most platforms the default is not set for high-speed transfers.
		His article provides a table that calculates common Internet latency times with a buffer size of 16Kbytes across a city, a continent, an undersea path across a large ocean, and satellite.
		Using the above considerations, focusing on latency and bandwidth for sharing my team’s website, I would have my boss upstairs, my co-worker at the next desk and my classmates view the page from the FTP server.
	www.wam.umd.edu /~kwillis2/Casestudyone.html (1654 words)

	Unidata - Re: IDD Delays: Latency vs. Bandwidth
		> >Unfortunately, network latencies are not necessarily symmetric, so >running ldmping from a downstream host to an upstream LDM won't always >give a good approximation of the network latency in the other >direction.
		> >This RPC latency as measured by ldmping may be the limiting factor for >many sites, rather than the volume of the data.
		For example, the HDS rate varied from 0.3 to 3.8 products/second >during different hours of this period.
	www.unidata.ucar.edu /content/support/help/MailArchives/ldm-users-list/msg01404.html (1170 words)

	TidBITS#368/03-Mar-97
		Bandwidth Still Matters -- Having said all this, you should not conclude that I believe bandwidth is unimportant.
		Bandwidth is valuable for its own sake, but also for its effect on overall latency - the important issue is the total end-to-end transmission delay for a data packet.
		Telephone companies argue that ISDN is as good as new technologies like cable modems because though cable modems have much higher bandwidth, that bandwidth is shared between lots of users so the average works out the same.
	www.tidbits.com /tb-issues/TidBITS-368.html (4016 words)

	Encyclopedia: Latency vs Bandwidth
		People who viewed "Latency vs Bandwidth" also viewed:
		Latency is fairly low (typically about a quarter of a second) and the size of an average web page (around 30-100 kilobytes) will transfer in less than 10 seconds.
		To download a 5 GB DVD over this 1.5 Mb/s connection would take about 7.4 hours.
	www.nationmaster.com /encyclopedia/Latency-vs-Bandwidth (575 words)

	Netgear FS108 report
		Both are somewhat questionable in that the performance of the NIC and TCP stack are mixed in to whatever you get from netperf, and the specs are in the best of all possible worlds and may not reflect the real one.
		According to the specs, the FS108 does store and forward with 15 usec maximum latency -- its more expensive cousin the FS508 (for more than twice as much money) does cut through and has a spec of 11 usec maximum latency.
		This is with a genuine 21141 Tulip on one end (:-) and a $20 generic RTL8139 on the other -- not a spectacular NIC, according to Don Becker, although it does ok here.
	www.beowulf.org /pipermail/test/1999-August/007139.html (549 words)

	The Bandwidth (Site not responding. Last check: 2007-11-04)
		(b) show the bandwidth obtained between two nodes of the CM-5 for
		(a) is that, as expected, the native message-passing library is the most efficient, with an asymptotic bandwidth of 8.06 Mbytes/sec.
		bandwidth is fairly close to the performance of the native system.
	www.netlib.org /utk/papers/pvmmpp/node22.html (97 words)

	TR Forums :: View topic - Opteron NUMA, latency + bandwidth boost questions
		Remember there is inherent latency from the memory request arriving at the RAM stick and the actual data coming out on the data lines.
		But my question is why latency would be increased by having RAM hanging off both CPUs as opposed to just one.
		No, it was comparing latencies on the same motherboard, measured with RAM off of both CPUs, versus measured with RAM off of just one CPU.
	tech-report.com /forums/viewtopic.php?p=352078&highlight=&sid=391f04c64087bbb36cacdf867d486c51 (1375 words)

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