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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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How to calculate effective equipment impairment value Ie-eff?

I am trying to find the MOS score for calls, and now stuck at Ie-eff calculation. From ITU-T g 113 doc i got the below table data, but i couldn't get the Ie-eff values as in below table by the following…
Binu Babu
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ovs-ofctl queue-stats command not working and I cannot find ovs-vswitchd.log file

now I'm using ovs 2.4.0, and I made queues in Qos and stuck it to port. I can check queue list using ovs-vsctl list queue command, and I can also watch ovsdb-tool show-log command's result.(all queue is generated already.) I checked the…
makerSM
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MYSQL limit CPU resources

A couple days ago a client called me because their server (30 concurrent users) was hunging each a week. After a research, I detected that one report was using a massive use of the server disk for almost 7 minutes. ...Despite the fact than the…
Grenville Tryon
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Veins(Omnet++) WAVE packet priority mapping to EDCA(Enhanced Distributed Channel Access)

When creating WaveShortMessage or (wsm) in Veins, there is a priority field that needs to be specified for each packet. The priority levels that can be used are 0-3. Also based on this paper WAVE uses EDCA as MAC layer protocol. EDCA has four…
aaa
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Avoid to receive the same topic that I send

I've an OpenDDS node that's both a DataDriver and DataReader. The consequence is that if the node send a topic, the same topic is received from the same node. Is there a QoS policy that avoid this behaviour? I want that a node can receive the topic…
Jepessen
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Determining maximum accepable email lag

This question is not 100% technical. I've looked online and I couldn't find this being discussed. We have a forgot username feature in our website which mails the username to the user's email address, using our own mail server. We also put a message…
dozer
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What is skb->priority in linux? When is it used?

I am trying to understand a QoS implementation on an embedded system. Is this a kernel level prioritization for QoS?
sbr
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How to set quality of service within AFNetworking?

Does anyone knowing about set qos class in AFNetworking? Because some of request in my app triggers time out, at the same time there is other operations of operation queue going on using network. I want to set all networking request by AFNetworking…
Andy_24
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TOS to 802.11 QOS Control on iPhone

We have an audio over IP app based on the iPhone, and we're currently playing with setting the TOS level and seeing how this is reflected in the 802.11 Qos Control field. We're doing this simply setsockopt call: int tos = 0xB8; // VOICE …
Chuck D
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I can't find DSCP field in IP header, only the deprecated TOS field

I will try to garantee some QoS with my access point made with Raspberry Pi. Before starting, I'm getting my hands dirty: I read about the tcp, udp and ip headers. In the IP header description I saw the DSCP field, originally defined as the Type of…
elmazzun
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Calling setsockopt many times

I have application which uses sockets to transfer data between two clients. It uses a single socket to communicate control and data traffic (over UDP). Qos and tos fields of IP header can be changed using setsockopt(sockfd, IPPROTO_IP, IP_TOS, …
ItsMe
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RTI DDS Qos profile history not working as expected

I am currently using RTI DDS for a pub sub system I am implementing, and for some topics want to keep a history depth of only 1 to keep to be resent if ever needed and for other topics, want to keep all the history to be resent if ever needed. Below…
jgr208
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DDS 9th topic causes a crash

I am using DDS (more specifically RTI DDS) for a java application. I am creating each topic for my DDS implementation one by one in code so thus I can test each one with a DDS spy after the code is written. When I wrote the 8th topic everything…
jgr208
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The two NICs bridged together ingress are redirected to ifb, but it don't work ,why?

I have a host that have two NICs, so it can be seen as a gateway, and the two network ports bridge. Then I make the two network interfaces' ingress traffic to redirect to an IFB, and then do the flow control of the IFB, but it do not work, why? The…
choumin
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How to set router parameters for IEEE 802.11E QoS Streaming over MultiHop

I am working on a multi-hop project in opnet. I am unable to set the router parameters in opnet . The sender and receiver nodes mac addresses and destination addresses are assigned, but how to set them to the router(Currently auto -assigned). Since…
rc reddy
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