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BBR TCP (Bottleneck Bandwidth and RTT) BBR is a new algorithm for TCP Congestion Control. It was tested in Google`s data center networks as well as on some of their...
IP Performance Metrics (IPPM) Working Group An IETF Working Group that has been chartered in 1997 to define metrics for network performance. Over the years, the group...
CUBIC An enhancement of BIC, this was added to the BIC implementation in Linux 2.6.16, and became the default algorithm in 2.6.19. In Linux 2.6.26, the algorithm...
Statistics for PERTKB Web Month: Topic views: Topic saves: File uploads: Most popular topic views: Top contributors for topic save and...
Datacenter TCP (DCTCP) Large datacenter networks pose specific problems for TCP congestion control. For example, bursty traffic from multiple sources and relatively...
Path MTU The Path MTU is the Maximum Transmission Unit (MTU) supported by a network path. It is the minimum of the MTUs of the links (segments) that make up the path...
IETF LMAP Working Group The Working Group in the IETF was chartered to develop data models and protocol for performance measurement of broadband access....
Explicit Congestion Notification (ECN) The Internet`s end to end rate control schemes (notably the TransmissionControlProtocol (TCP)) traditionally have to rely on...
CoDel (Controlled Delay) CoDel is a modern Active Queue Management (AQM) algorithm. It was proposed as part of the efforts to fight BufferBloat `just one piece of...
PIE (Proportional Integral Controller Enhanced) A group of authors from Cisco Systems proposed PIE as a Active Queue Management controller alternative to CoDel. The...
Site Tools of the PERTKB Web AlessandraScicchitano 17 May 2012
NETWORK A list of topics and information related to the network. Specific Network Technologies: Ethernet: Duplex modes and auto negotiation, LAN Collisions...
DS3.3.3a Basic Guide to Network Performance SimonLeinen 09 Apr 2006
Linux Specific Network Performance Tuning Hints Linux has its own implementation of the TCP/IP Stack. With recent kernel versions, the TCP/IP implementation contains...
Active Queue Management (AQM) Packet switching nodes such as routers usually need to accomodate queues to buffer packets, when incoming traffic exceeds the available...
IPv6 packet drops eduPERT case ticket: DFN#2016091610000414 GGUS Ticket ID: #123930 ASSIGNED to `EDUPERT`Author: DFN NOC Robert StoyProblem Description: end...
Performance Case Studies Performance Case Studies: Apache Scaling; 10Gbps Experiments (FZ Karlsruhe); Hung transfer (stateful firewall...
BufferBloat The term `Bufferbloat` was coined by Gettys, when spending much effort on attempts to understand why his home network was performing so poorly (1.2 seconds...
High Speed TCP Variants There have been numerous ideas for improving TCP over the years. Some of those ideas have been adopted by mainstream operations (after thorough...
TCP (Transmission Control Protocol) The Transmission Control Protocol (TCP) is the prevalent transport protocol used on the Internet today. It uses window based transmission...
(TCP) Incast A performance issue can be observed with some distributed applications in data center networks. The basic story is that a client sends a request to multiple...
KurtBaumann 2015 10 18 PERT Case 19.03.2015 Author: Daniel Stirnimann (SWITCH) Motivation for Performance Tests With major changes in our server configuration or...
Specific Network Technologies This section of the knowledge base treats some (sub)network technologies with their specific performance implications. Ethernet...
Explicit Control Protocol (XCP) The eXplicit Control Protocol (XCP) is a new congestion control protocol developed by Dina Katabi from MIT Computer Science...
PERTKB Web Preferences The following settings are web preferences of the PERTKB web. These preferences overwrite the site level preferences in ., and can be...
The `Wizard Gap` The Wizard Gap is an expression coined by Matt Mathis (then PSC) in 1999. It designates the difference between the performance that is `theoretically...
fq codel In 2012, Eric Dumazet contributed the fq codel queueing discipline to the Linux kernel. It is thus available in recent Linux versions (3.5 and later)...
tcpdump One of the early diagnostic tools for TCP/IP that was written by Van Jacobson, Craig Leres, and Steven McCanne. Tcpdump can be used to capture and decode...
TCP`s Initial Congestion Window (ICW, IW or initcwnd) The original version of TCP Congestion Control specified that the congestion window should start at the maximum...
Multipath TCP MPTCP MPTCP is an extension to regular TCP that enables a transport connection to operate across multiple paths simultaneously. It is important to...
Prague TCP An effort to standarize a new variant of TCP congestion control. It should include the ideas behind DCTCP, but be able to coexist peacefully with other...
Tracebox This is a traceroute variant that tries to detect middleboxes along a network path. This is available both as a standalone tool and as an option in scamper...
traceroute like Tools Traceroute is used to determine the route a packet takes through the Internet to reach its destination; i.e. the sequence of gateways or `hops...
intrace (in band traceroute) This is a traceroute variant that uses an existing TCP connection to probe the route. This should make it usable even through flow aware...
pflang...
Netflow based Tools Netflow: Analysis tools to characterize the traffic in the network, detect routing problems, security problems (Denials of Service), etc. There...
Netperf A client/server network performance benchmark (debian package: netperf). Example coming soon Flent (previously netperf wrapper ) For his measurement...
Large Send Offload (LSO) This feature is also known as `Segmentation Offload`, `TCP Segmentation Offload (TSO)`, ` TCP Multidata Transmit (MDT), or `TCP Large Send...
QUIC An experimental protocol developed by Google to speed up latency sensitive applications such as Web search. A prime goal is that connections can be established...
Network Protocols This section contains information about a few common Internet protocols, with a focus on performance questions. Transmission Control Protocol...
File Transfer A common problem for many scientific applications is the replication of often large data sets (files) from one system to another. (For the generalized...
Fast Data Transfer (FDT) FDT is a file transfer utility written with the goal to achieve high throughput over LFNs using standard TCP. It is written in Java, which...
Welcome to the eduPERT Knowledge Base!!!! If you`d like to know more about us and what the eduPERT community is up to, visit our portal: http://edupert.geant.net...
Software Defined Networking (SDN) `SDN provides a global view of the state of the network by having visibility and control of the forwarding plane. On top of this...
Web10G Web10G is a follow up of the Web100 project, which had given us things like the web100 TCP instrumentation in the Linux kernel (underlying tools such as...
Internet Engineering Task Force (IETF) The IETF is an open community setting standards for the Internet community. Various Working Groups (WGs) use processes around...
TCP Acknowledgements In TCP`s sliding window scheme, the receiver acknowledges the data it receives, so that the sender can advance the window and send new data...
Generic Receive Offload (GRO) GRO is the `generic` (hardware agnostic) variant of LRO, similar to how GSO is the generic version of LSO. SimonLeinen 2015 01...
Network Adapter and Driver Issues One aspect that causes many performance problems is adapater and NIC compatability issues (full vs half duplex as an example. The...

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Topic revision: r1 - 2006-11-15 - TWikiContributor
 
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