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Topic: Weighted round robin


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In the News (Wed 17 Jul 19)

  
  LVS Scheduling Overview
Weighted round-robin scheduling is a better choice if there are significant differences in the capacity of certain real servers in the pool.
Although adding weight to varying hardware configurations in a real server pool can help load-balance the cluster more efficiently, it can cause temporary imbalances when a real server is introduced to the real server pool and the virtual server is scheduled using weighted least-connections.
Servers A and B are weighted at 1 and the third, server C, is weighted at 2.
www.centos.org /docs/2/rhl-ig-as-x86-en-2.1/s1-lvs-scheduling.html   (1130 words)

  
  Weighted Round Robin Scheduler
If parameters are not used, the weight of each queue is the ((priority value of the queue)+ 1) / (sum of all the priority_values for all the queues).
Otherwise, users must specify the weight for all of the queues on that interface, such that the sum of the weights equals one, using the following parameter:
Where priority is the integer value of the priority assigned to each queue (numbered from 0…num_of_priority_queues-1), and the weight is a floating point number between zero and one.
www.cis.udel.edu /~jaikaeo/qualnet/manual/manual311.html   (192 words)

  
 Round
Round Hill, Virginia Round Hill is a town located in 2000 census, the town had a total population of 500.
Round Lake, New York Round Lake is a village located in 2000 census, the village had a total population of 604.
Round Lake, Wisconsin Round Lake is a town located in 2000 census, the town had a total population of 962.
www.brainyencyclopedia.com /topics/round.html   (1179 words)

  
 Deficit round robin - Wikipedia, the free encyclopedia
Deficit round robin (DRR), also deficit weighted round robin (DWRR), is a modified weighted round robin scheduling discipline.
A maximum packet size number is subtracted from the packet length, and packets that exceed that number are held back until the next visit of the scheduler.
WRR serves every nonempty queue whereas DRR serves packets at the head of every nonempty queue which deficit counter is greater than the packet's size.
en.wikipedia.org /wiki/Deficit_round_robin   (185 words)

  
 Weighted Round-Robin Scheduling - LVSKB
In an optimized implementation of the weighted round-robin scheduling, a scheduling sequence will be generated according to the server weights after the rules of IPVS are modified.
The weighted round-robin scheduling is better than the round-robin scheduling, when the processing capacity of real servers are different.
Actually, the round-robin scheduling is a special instance of the weighted round-robin scheduling, in which all the weights are equal.
kb.linuxvirtualserver.org /wiki/Weighted_Round-Robin_Scheduling   (237 words)

  
 IBM Redbooks | IBM WebSphere Application Server Network Deployment V5.0 - Workload Management Policies
New browser requests are then sent in a round robin to the other application servers and subsequently the weight for each application server is decremented by 1.
When there are no marked up servers with positive weights, the weights of the servers will be changed as follows: a multiple of the lowest common denominator of the servers’ maximum weight is added back to the current weights to make all weights positive again.
Weights are not taken into account as with the round robin approach.
www.redbooks.ibm.com /redbooks.nsf/ffb155b535b4144485256c050061937a/a4b1efe4bcc19e0485256d5e00450536?OpenDocument&printable   (923 words)

  
 Configuring Quality of Service on a FastIron Edge Switch and FastIron Edge Switch X-Series   (Site not responding. Last check: 2007-11-06)
If you are using the weighted round robin mechanism instead of the strict mechanism, you can change the weights for each queue by changing the minimum percentage of bandwidth you want each queue to guarantee for its traffic.
The weight associated with each queue controls how many packets are processed for the queue at a given stage of a cycle through the weighted round robin algorithm.
WRR forwards a specific number of bytes in one queue before moving on to the next one in a round-robin fashion.
www.foundrynet.com /services/documentation/ecmg/QoS-FES.html   (3074 words)

  
 Device and method for implementing queueing disciplines at high speeds - Patent 5268900
Thus, a weighted round-robin technique is established between the two queue groups wherein the first queue group is allocated one-third of the trunk bandwidth and the second queue group is allocated two-thirds of the trunk bandwidth.
The scan table of the present invention is constructed from the intermediate WRR table by substituting entries for the actual queues to be served, according to the HOLP discipline in the present exemplary embodiment, for entries corresponding to queue groups.
In the preferred embodiment, the intermediate WRR table construction is not needed explicitly; it may be combined, where desired, with construction of the scan table.
www.freepatentsonline.com /5268900.html   (8948 words)

  
 [No title]
WRR will integrate an aging process, alter the time slice for each process according to “weight”, and also reorder the process queue according to “weight”.
This time slice variable in WRR is varied for each individual job according to the weight given to it by the operating system.
In the case of WRR the algorithm will increase the weight of that job by a value of one for every three full job queue cycles it is processed.
www.cs.gsu.edu /~cscyqz/courses/os/Paper1.doc   (1276 words)

  
 Per-Class Urgency Counter WRR Scheduler (ICS-FORTH)
The latter work includes hardware for heap (priority queue) management, for the case of arbitrary weight factors, and the scheduler presented here, for the case where weight factors are drawn from a small set of values.
The total weight factor of all flows in class A is 10, in the above example; for class B this number is 6, and for class C it is 4.
Each cell arrival may result in a weight update, if it belongs to a previously idle flow (that flow must be added to the other flows of its class that are entitled for service, thus increasing the weight of that class).
www.ii.uib.no /~markatos/arch-vlsi/muqpro/classSch.html   (1099 words)

  
 Method for prioritizing, selectively discarding, and multiplexing differing traffic type fast packets - Patent 5231633   (Site not responding. Last check: 2007-11-06)
If all the queues have packets to send, WRR has the effect of dividing the trunk bandwidth among the queues in the ratio of the weights.
When some queues are idle, WRR does not waste bandwidth but continues to examine the queues in the prescribed order until it finds a packet.
WRR is similar to a conventional TDM system except that timeslots do not go idle-allocated bandwidth unused by one queue can be used by another queue.
www.freepatentsonline.com /5231633.html   (6719 words)

  
 Weighted Round-Robin Scheduling Module in Reprogrammable Hardware
Any queues with a registered weight greater than or equal to the current priority of the round are scheduled for service.
Cells arriving on VCI 23 were assigned a weight of 2 while cells arriving on VCI 27 were given a weight of 8.
The weights assigned to each VCI in the test file start at three on VCI 23 and increase by one for a weight of 9 on VCI 29.
www.arl.wustl.edu /~lockwood/class/cs535/project/fairqueue   (1637 words)

  
 Job Scheduling Algorithms in LVS
In the implementation of the weighted round-robin scheduling, a scheduling sequence will be generated according to the server weights after the rules of Virtual Server are modified.
The weighted least-connection scheduling is a superset of the least-connection scheduling, in which you can assign a performance weight to each real server.
The Virtual Server Administrator can assign a weight to each real server, and network connections are scheduled to each server in which the percentage of the current number of live connections for each server is a ratio to its weight.
www.linuxvirtualserver.org /docs/scheduling.html   (1045 words)

  
 QoS Scheduling and Queueing on the Catalyst 3550 Switches - Cisco Systems
WRR is a mechanism that is used in output scheduling on the 3550.
WRR per packet: This is the algorithm that is implemented in the 3550 switch.
WRR is applied per packet, and the amount of data that are transmitted from each queue differs between the two queues.
www.cisco.com /en/US/tech/tk389/tk813/technologies_tech_note09186a00801558cb.shtml   (3274 words)

  
 ICS - CARV: Weighted Round-Robin Scheduling R&D at CARV-ICS-FORTH
The smoothest operation of a weighted round-robin scheduler (operation with the least amount of service time jitter) is achieved when the weight factors of the (possibly many thousands of) flows are picked from a relatively small ``menu'' of allowed factor values --e.g.
Based on the urgency counters, we perform weighted round-robin scheduling among the classes, and then use plain round-robin scheduling inside each class to select the next-to-be-serviced flow.
Their common substrate is that, for each flow or packet or cell, a priority value is maintained --oftentimes corresponding to the next time-to-service value-- and the scheduler has to choose the minimum among these values, corresponding e.g.
www.ics.forth.gr /carv/muqpro   (1241 words)

  
 7.2 Load balancing policies on clustered Web servers
Round robin is widely used because it is easy to implement and implies only a minimum overhead.
In the weighted round robin policy, the incoming requests are distributed among the servers in a round robin fashion, weighted by some measure of the load on each of the servers.
Policies like join shortest queue and shortest remaining processing time are cases of the weighted round robin policy, where the front-end dispatcher requires detailed information about the load and operation of each server in order to assign incoming requests to servers of the cluster.
www.cs.wm.edu /~riska/PhD-thesis-html/node94.html   (449 words)

  
 CommsDesign - Implementing a Heap-Based WRR Scheduling Mechanism: Part 1
The smoothest operation of WRR scheduler is achieved when urgency counters are kept for each of the queue.
For each selection, WRR scheduler should be able to sort the entire sixty-four 17-bit urgency counters and select the maximum urgency counter.
One of the fairest WRR selections is achieved by using urgency counters for each of the queues.
www.commsdesign.com /design_corner/OEG20030827S0008   (2874 words)

  
 [No title]
This one pager describes the enhancements that are proposed to this component that include rule based load balancing such as weighted round robin and user defined decision.
Load balancing enhancements This section describes the enhancements that are proposed to the component that include weighted round robin, user defined decision and the ease of administration.
The disadvantage to this method is that the weights are static and the administrator has to calculate the instance weights appropriately.
www.glassfishwiki.org /gfwiki/attach/OnePagersOrFunctionalSpecs/LB-onepager.txt   (1411 words)

  
 ServerCop.com :: Secure Dedicated & Shared Web Hosting :: Linux & Windows :: Domain Registration   (Site not responding. Last check: 2007-11-06)
Each server is given a weight and a integer value that stipulates the processing capacity with a default weight of 1.
During implementation of the weighted round-robin scheduling, a scheduling sequence will be produced based on server weights after the rules of the virtual server are rectified.
The virtual server administrator can assign a weight to each real server, and network connections are programmed on each server in which the percentage of the current number of live connections for each server is a ratio to its weight.
www.servercop.com /services-clustering.html   (880 words)

  
 WRR network scheduling for Linux
WRR is a network scheduling module for Linux written by Christian Worm Mortensen.
WRR will work on 2.4 kernels from 2.4.17 and newer and on most (if not all) 2.6 kernels.
You can get the original distribution files for WRR and WIPL here, but the web pages are lost (you could try to bug Christian Worm Mortensen to see if he has them).
www.zz9.dk /wrr   (586 words)

  
 : Round Robin Scheduler, review at WorldSSP.net   (Site not responding. Last check: 2007-11-06)
Weighted Round-Robin Schedulers for Advanced QoS in High Speed Networks Computer Architecture and VLSI Systems Division, Institute of Computer Science (ICS), FORTH Science and Technology Park of Crete, P.O.Box 1385, Heraklion, Crete, GR 711 10 Greece In order to provide advanced Quality of Service (QoS) architectures in high speed networks, it is commonly...
Round Robin Scheduler 3.0.7The Round Robin Scheduler has been designed to help you quickly create round-robin schedules for your sports organization.
Weighted Round-Robin Schedulers for Advanced QoS in High Speed Networks In order to provide advanced Quality of Service (QoS) architectures in high speed networks, it is commonly agreed, nowadays, that one needs (i) per-flow queueing, and (ii) weighted round-robin scheduling; the combination of the two is frequently referred to as Weighted Fair Queueing.
www.worldssp.net /webinfo_l.asp?proid=2929   (399 words)

  
 Weighted Round Robin (WRR)   (Site not responding. Last check: 2007-11-06)
The WRR qdisc distributes bandwidth between its classes using the weighted round robin scheme.
All classes which have sufficient demand will get bandwidth proportional to the weights associated with the classes.
A set of scripts setting up a relevant behavior for such a site is a central part of the WRR distribution.
lartc.org /howto/lartc.adv-qdisc.wrr.html   (206 words)

  
 Pramati Server Cluster Concepts
The default weight of the node is 1.
In a variant, Weighted Round Robin, the nodes are given unequal weights based on their capacity to handle workload, accordingly queueing them to receive the next request.
Round robin works on a rotating basis in that one server IP address is handed out, then moves to the back of the list; the next server IP address is handed out, then it moves to the end of the list; and so on, looping through the nodes.
www.pramati.com /docstore/1230006/help/cluster/cluster_spl.htm   (2410 words)

  
 ipvsadm
Optionally, a persistent timeout and network mask for the granularity of a persistent service may be specified.
When specifying a real server, the packet-forwarding method and the weight of the real server, relative to other real servers for the virtual service, may be speci- fied, otherwise defaults will be used.
-w, --weight weight Weight is an integer specifying the capacity of a server rela- tive to the others in the pool.
linuxcommand.org /man_pages/ipvsadm8.html   (2740 words)

  
 Weighted Round-Robin Scheduling R&D at CARV-ICS-FORTH
The smoothest operation of a weighted round-robin scheduler (operation with the least amount of service time jitter) is achieved when the weight factors of the (possibly many thousands of) flows are picked from a relatively small ``menu'' of allowed factor values --e.g.
Several algorithms have been proposed in the literature for weighted round-robin scheduling in the general case of arbitrary weight factors.
Their common substrate is that, for each flow or packet or cell, a priority value is maintained --oftentimes corresponding to the next time-to-service value-- and the scheduler has to choose the minimum among these values, corresponding e.g.
www.ite.gr /ics/carv/muqpro/wrrSched.html   (1232 words)

  
 Virtual Server Scheduling Algorithms   (Site not responding. Last check: 2007-11-06)
For example, the real servers, A, B and C, have the weights, 4, 3, 2 respectively, a good scheduling sequence will be ABCABCABA in a scheduling period (mod sum(Wi)).
The weighted round-robin scheduling doesn't need to count the network connections for each real server, and the overhead of scheduling is smaller than dynamic scheduling algorithms, it can have more real servers.
The round-robin scheduling is a special instance of the weighted round-robin scheduling, in which all the weights are equal.
gd.tuwien.ac.at /infosys/servers/w3lvs/scheduling.html   (642 words)

  
 SysMaster - Support - Tech Guides
The weighted round-robin does loadbalancing on the basis of a static algorithm as the actual number of active connections for each server is not taken into account.
Optimized Weighted Least Connections: This mode is similar again to the Weighted Round Robin algorithm but all weights are calculated dynamically to represent the current responsiveness of the servers in the managed server array.
Both Optimized Weighted Round Robin and Optimized Weighted Least Connection models are developed to closely follow and balance the deviations of the load of each server as to achieve maximum efficiency and speed from the server array as a whole.
www.sysmaster.com /st_tech_guide1.htm   (949 words)

  
 ActiveGlobe WebOTX: Business Solution | NEC
Various types of load balancing methods such as simple round robin scheduling and Weighted round robin scheduling are available according to the unit.
It is a method to pass the objects of each server out by round robin scheme when objects of each server are managed in the name server, and the object acquisition request is received from the client.
In the round robin load balancing (including weighting), the server that is connected by clients is decided when acquiring objects.
www.nec.co.jp /middle/WebOTX-e/function/load.html   (467 words)

  
 USENIX 2001 Annual Technical Conference Paper
The basic idea is that each client has an associated weight, and resources are allocated to the clients in proportion to their respective weights.
Weighted round-robin (WRR) provides proportional sharing by running all clients with the same frequency but adjusting the size of their time quanta.
Because the error axis is scaled to display the wide range of WRR's error values, it is difficult to even distinguish the two surfaces for VTRR in Figure 1.
www.usenix.org /event/usenix01/full_papers/nieh/nieh_html   (10307 words)

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