Quality of Service advanced service is designed as a service plugin. The service is decoupled from the rest of Neutron code on multiple levels (see below). QoS extends core resources (ports, networks) without using mixins inherited from plugins but t…

什么是 QoS ? QoS (Quality of Service) 是发送者和接收者之间,对于消息传递的可靠程度的协商. QoS 的设计是 MQTT 协议里的重点.作为专为物联网场景设计的协议,MQTT 的运行场景不仅仅是 PC,而是更广泛的窄带宽网络和低功耗设备,如果能在协议层解决传输质量的问题,将为物联网应用的开发提供极大便利. 三个 QoS 级别简介 在 MQTT 协议里,定义了三个级别的 QoS,由低到高分别是: 最多一次 (QoS0) 至少一次 (QoS1) 有且仅有一次 (QoS2…

Background: Why we need QoS ? There are premium subscribers who always want to have better user experience on their 4G LTE device. These users are willing to pay more for high bandwidth and better network access on their devices. Not only the subscri…

http://tropicaldevel.wordpress.com/2013/07/15/quality-of-service-in-openstack/ In this post I will be exploring the current state of quality of service (QoS) in OpenStack.  I will be looking at both what is possible now and what is on the horizon and…

来自:http://www.hivemq.com/blog/mqtt-essentials-part-6-mqtt-quality-of-service-levels Quality of Service What is Quality of Service? The Quality of Service (QoS) level is an agreement between sender and receiver of a message regarding the guarantees of…

w https://en.wikipedia.org/wiki/Quality_of_service Quality of service (QoS) is the overall performance of a telephony or computer network, particularly the performance seen by the users of the network. To quantitatively measure quality of service, se…

1, /etc/neutron/neutron.conf   service_plugins = router,metering    notification_driver=neutron.openstack.common.notifier.rpc_notifier2, /etc/neutron/metering_agent.ini   debug = True    driver = neutron.services.metering.drivers.iptables.iptables_dr…

原文 可以针对每个ReRoute设置对下游服务的熔断器circuit breaker.这部分是通过Polly实现的. 将下面的配置添加到一个ReRoute下面去. "QoSOptions": { "ExceptionsAllowedBeforeBreaking":3, "DurationOfBreak":5, "TimeoutValue":5000 } ExceptionsAllowedBeforeBreaking必须大于0.…

OVS即开放虚拟交换标准,不仅仅是为了支持OpenFlow协议,而是为了给虚拟化平台上运行的虚拟机实例提供一套纯软件实现的路由交换协议栈.具体点说,Open vSwitch是在开源的Apache2.0许可下的产品级质量的多层虚拟交换标准!它旨在通过编程扩展,使庞大的网络自动化(配置.管理.维护),同时还支持标准的管理接口和协议(如NetFlow, sFlow, SPAN, RSPAN, CLI, LACP,802.1ag). Standard 802.1Q VLAN model with tru…

QoS(Quality of Service,服务质量)指一个网络能够利用各种基础技术,为指定的网络通信提供更好的服务能力, 是网络的一种安全机制, 是用来解决网络延迟和阻塞等问题的一种技术. 在正常情况下,如果网络只用于特定的无时间限制的应用系统,并不需要QoS,比如Web应用,或E-mail设置等.但是对关键应用和多媒体应用就十分必要.当网络过载或拥塞时,QoS 能确保重要业务量不受延迟或丢弃,同时保证网络的高效运行.在RFC 3644上有对QoS的说明. 基本介绍 折叠参数 QoS是通过给…