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Questions tagged [qos]

Quality-Of-Service (QoS) is the management of system resources, network or otherwise, to apply greater returns with minimal overhead, providing a measurable increase in performance.^1 ^2 ^3

Application QoS is related to thread management or Interprocess Communication (IPC) management as it relates to hardware and software resource access.

"In the field of computer networking and other packet-switched telecommunication networks, quality of service refers to traffic prioritization and resource reservation control mechanisms rather than the achieved service quality. Quality of service is the ability to provide different priorities to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow."

199 questions
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mqtt not publishing data onto the broker when qos set to 2

client.publish("topic", payload,qos=2) not publishing data onto the broker whereas the same is working for qos=0 and 1.I have not defined persistence, it is set to default value. import paho.mqtt.publish as publish import paho.mqtt.client as…
HARSH PANDEY
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"cannot open qos.h" when trying to use WinSock2

The title sums it up. I installed the latest windows SDK here. The console tries to access a folder named after an older SDK version (which I uninstalled) and a folder called "winsock2.h", which doesn't exist. The exact path of the header its trying…
Borzi
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RabbitMQ multiqueue consumer (independently consumed queues)

TL;DR Is there any (Node.JS) pattern to stop consuming a queue after a time (10 seconds), and closing the connection, without interrupting the processing of messages were not yet acked? Longer version We are sending out millions of push…
András Bártházi
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MQTT QoS Downgrade

I am using MQTT in embedded applications. I have gone through the documentation extensively and I understand how QoS feature is implemented in MQTT, and what each value means. As it is known, MQTT does QoS downgrade, which means that a message will…
Fotis Panagiotopoulos
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Quality of Service : remote login requirements for handling jitter

I'm currently studying for my upcoming examination of Computer Networks and am covering the section "Quality of Service". Here, a table is shown displaying requirements by application in terms of bandwith, delay, jitter and loss. To clarify with a…
SND
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Generic QoS Message batching and compression in Java

We have a custom messaging system written in Java, and I want to implement a basic batching/compression feature that basically under heavy load it will aggregate a bunch of push responses into a single push response. Essentially: if we detect 3…
Dougnukem
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Can't figure out the root cause of out of resources error

I have an application using RTI DDS using dynamic data to set my messages. When I try to send a string that was 300kb in a file I get the following error code: com.rti.dds.infrastructure.RETCODE_OUT_OF_RESOURCES at…
jgr208
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Alternative to the mod_qos module for Apache 2.4

We have been using Apache 2.2 (MPM Worker) for years now and we intend to migrate to Apache 2.4. Our architecture is strongly shared and we manage about 500 applications. We have chosen to split these applications by technology and to associate one…
user3207481
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How do I identify the source of a UDP packet in an access point?

I'm creating a kind of access point. I capture all packets, of all the types, from my machine, in order to prioritize them before forwarding them, according to the default Quality of Service (QoS) classes. By calling socket with the ETH_P_ALL…
elmazzun
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Traceroute with DSCP bits (QoS) with Scapy

Scapy allows the setting of DSCP or tos bits in IP packets, using the upper 6 bits of the 8 bit Type of Service field. a = IP(dst="172.31.0.1", tos=184) or send(IP(dst="172.31.0.1")/ICMP()) It also permits traceroutes and modifications to the IP…
bardgett
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Application cannot successfully change dscp value on win7

These questions are quite similar to mine : Why DSCP always 0x00 (default) on Windows 7? Issue with DSCP marking using setTrafficClass and WireShark I try to send packets with a custom dscp. I can't use MS QoS policies as the user should be able to…
pwillemet
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How can I determine the quality of service in WCF?

I want to determine the following QoS Attribute of my service: Response Time Reliability Availability I will be creating an application that will select a service based on the mentioned attribute.
Lance
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How Can I simulate Packet Drop at QoS (Traffic control)

I wanted to simulate a situation where ping/icmp packet following through egress path should be dropped due to Linux QoS and these dropped packet should be captured by VLAN stats under ifconfig command. I would want to trace down the code where…
Amit Singh Tomar
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Are the QoS API's in Winsock useful?

Quality of Service (QoS) was designed to manage bandwidth usage, which implicitly assumes that applications compete for that (limited) resource. Is that really, ever a concern for ANY applications these days? It also assumes that the QoS protocols…
bob quinn
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Scapy waiting for multiple packets

In order to perform a HTTP GET, I need to send a packet (the GET / HTTP/1.0\n\n) and wait for 3 packets: The ACK of my GET The GET answer: HTTP/1.0 200 OK and the FIN ACK of the transmission I found 2 ways: => use sr() with multi option => use sniff…
user1789326
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