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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."

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tc-sfq alternative that limits by bytes?

Is there an alternative to tc-sfq (Stochastic Fairness Queueing) that allows to configure a limit based on the packet size (total bytes) instead of packet count? The reason for this is that given a packet size of 50 bytes, one htb class…
xnor
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Inconsistent packet delivery by NIC, NIC performance measurement

One of our customers experiences problem with our streaming application (win32). It seems like UDP (RTP) packets that should be sent by the application with some constant interval (say 20 ms) are actually sent with a greatly variable deltas (say…
Boris
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Lync 2010 - Primary key relationship betweeen QOS and CDR database records

Does anyone know what tables/fields are used to uniquely tie the records in the "lcsCDR" call detail records database to the Quality of Service "QOEMetrics" db? Currently using CnfDateTime but it does not give exact match for some reason! Thanks in…
Shanyman
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Why DSCP always 0x00 (default) on Windows 7?

I send (TOS/DSCP 12 for audio and 10 for control) packets, and trace them on Wireshark, but all I see is 0x00 on DSCP field, always. Why is that? I already tried to set the "DisableUserTOSSetting" field on registry to zero, didn't help. Any other…
NettaD
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Establish signal strength impact on wifi network speed

I'm developing a network support framework (initially for Android) which includes three basic services: Host discovery, Network Communication, and QoS Monitor. For the last service, I'm trying to implement a method that returns the maximum Messages…
Federico Cristina
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QOS for UDP on Linux or any other UNIX-like platform

I am doing some research related to QOS for UDP sending application. My application is sending UDP packets over possibly loaded networks. It does so with little bandwidth requirements when compared to, say, BitTorrent over UDP. Since my flows are…
wilx
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Dscp value in IP header for TCP SYN/SYN ACK

I have TCP client and server sockets and I have set the socket option IP_TOS on both the client and server socket with different values(say Client dscp = 0x21 and Server Dscp = 0x38). Now when I am trying to connect to the server the syn Packet…
abhihdr03
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Windows RSVP QoS service is stopped when no QoS-socket active. Can that be changed?

We have a program that uses QoS-sockets, our softphone application uses QoS for the RTP. That application is normally left running, sometimes however it is restarted. (Stop, wait 300ms, start.) We have found that when the softphone-application is…
leiflundgren
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Simplest QoS strategy for my RESTful Web Service

My RESTful Spring based Web Service receives differentiated user requests, say Gold, Silver and Bronze, where Gold requests have maximum priority, Bronze lowest one. So I want to implement some simple type of differentiated service provisioning.…
user1781028
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Unable to set speed limit using tc tbf

I am using tc to do QOS on an asterisk server. I want to prioritize voice and sip traffic but also cap all the rest to a fixed limit. Here is my script: #!/bin/bash IFACE=eth1 UPSPEED=1.5mbit tc qdisc del dev $IFACE root tc qdisc add dev $IFACE…
Yan Hudon
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bandwidth/QOS test - paid or free

I have to support a video rich web site. Many of the users are on a city/municipal computer and network. When a user reports a performance issue (video slow to load or hanging) we verify server and backbone and multiple endpoints. We are working…
phoenixAZ
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scapy receive waiting for 2 packets

I'm trying to perform http QoS with scapy. For the scanner, I need to get the connection time, the time between my GET, the begin of datas sent (the ACK from the server) and finally: the end of data. I have written that: …
user1789326
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QoS trough UPnP for improved VoIP quality on wireless lans

I'm working on an application that does VoIP, Cam-streaming and file transfers at the same time. Currently it runs under Windows, OS X, Android and iPhone/iPad. As you may understand, this can create quite some network traffic, especially if several…
jgaa
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MQTT message from server to client by bridge

How to check, that client, connected by bridge really get messege from server.
Zeta
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What stops me from my marking all my traffic with the highest priority?

I am trying to understand the use of the DSCP field in an ip header. If I want my website to be the fastest one, why can't I just mark my packets with the highest possible priority? I know there is limited percentage of high priority traffic that…
Networking pup
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