simulate network latency

Qdisc Add dev eth0 root netem loss 1% This command sets the transmission of the ETH0 network card to a random drop of 1% packets. Example: Executing on 216 #tc qdisc add dev eth0 root netem loss 10% displaying 16 packages only 13 have received. You can also set the success rate of packet loss: # TC Qdisc Add dev eth0 root netem loss 1% 30% This command sets the transmission of the ETH0 network card to a r

In all kinds of data in network media through network protocol (such as TCP/IP) for transmission, if the amount of information is too large to limit, excess network traffic will lead to slow device response, resulting in network latency. Unit: Millisecond (ms) How to defin

This behavior can be tricky when our IO-intensive applications suspect device IO jitter, such as a period of long wait times leading to performance or other problems, because the hardware jitter is infrequent and costly to reproduce. Luckily, Systemtap can save us. In principle, the IO we use is accessed through the file system, regardless of read/write/sync, and most of our files are opened in buffered mode. In this mode, if the Pagecache is not hit, you need to access the device. With this ba

Muduo network programming example 5: measure the network latency of two machines Chen Shuo (giantchen_at_gmail) Blog.csdn.net/solstice t.sina.com.cn/giantchen This is the fifth article in The muduo network programming example series.Article. Muduo full article list: http://blog.csdn.net/Solstice/category/779646

This article introduces a simple network program roundtrip, which is used to measure the network latency between two machines, that is, "roundtrip time/round trip Time/rtt". This article mainly examines the tcp_nodelay of the fixed-length TCP message and the function of the packet. The code for this article is shown in http://code.google.com/p/muduo/source/brows

. if the message is calculated directly, the latency is-700us. This result must be wrong, because the server and client are not in a clock domain (this is a concept in a digital circuit), and their time is directly reduced without significance. If we have measured that the server is 700 us faster than the client, we can use this data for one correction:-850 + = 150us. This result is more realistic. Of course, in practice, clock offset must pass throug

original articles, reproduced please specify: reproduced from the system technology non-amateur researchThis article link address: qperf measuring network bandwidth and latencyWhen we are doing Web servers, we are usually concerned about the bandwidth and latency of the network. Because many of our protocols are request-reponse protocols,

What is QoS? QoS (Quality of Service), a security mechanism of the network, is a technique used to solve problems such as network latency and congestion. It is necessary for key applications and multimedia applications. When the network overload or congestion, QoS ensures that important traffic is not delayed or discar

Resisting network interference is a major problem that needs to be solved in our network. Here we will explain how to solve the latency problem in detail. The latency of all 802.11 Wireless Networks in the city is complex. The city's security department plans to convert thousands of repeated passwords into more powerfu

Processing of network latency in online shooting games (Jinqing's column) Network latency in online games is unavoidable.For example, if a mobile client sends a command to receive confirmation from the server, there will be a latency of Ms,If the client is moved after ms,

Modifying the Registry improves the slow network speed caused by Tcp latency in Windows. TCP is a link-oriented communication protocol. Each sending and receiving action of both parties must be based on the normal communication link. Therefore, TCP provides the default ACK authentication mechanism. The ACK authentication method is related to the operating system. In TCP, data validation is often delayed. Wh

Ask for help! About network latency! -- Linux Enterprise Application-Linux server application information. For details, refer to the following section. I recently studied network latency. I have learned from some papers that network late