test jitter and packet loss

Summary Packet loss occurs when we use ping to check whether a system can run normally. packet loss occurs in the channel for various reasons. Ping uses ICMP send-back request and send-back response packets. An ICMP return request message is a request sent from a host or router to a specific target host. The machine

TC Qdisc Linux flow control under theModify Ping delay of the test Add rule: # TC Qdisc Add dev eth0 rootTo delete a rule: # TC Qdisc Add dev eth0 rootTo Modify a rule: # TC Qdisc Change dev eth0 rootTo view the rules:# TC Qdisc ListOR # TC Qdisc Showuse fromETH0InterfacePingthe delay is +Ms Up and down fluctuation forTenMstc Qdisc Add dev eth0 root netem delay 1000ms 10ms [Email protected] ~]# Tcqdisc ShowQdisc netem 8003:dev eth0 root refcnt 2 lim

, we set the maximum limit of 4,096, is the driver inside each receive a batch of packets, it will ixgbe_alloc_rx_buffers assign a batch of new SKB and pagePCI_DMA mapping to the hardware to collect packetsHere the first Tasklet dispatch to CPU1, cpu2 the problem can be explained, the VM packet triggered the network card cpu1, cpu2 on the interruption, until soft interrupt, KFREE_SKB, Trigger Idx_release, then tasklet_schedule, then TX _action has bee

Accustomed to TCP programming, it is wrong to think that UDP can handle these problems. A udp application must take full responsibility for reliability, including packet loss, duplication, latency, out-of-order, and connection failure.Generally, we develop and test on a LAN with good reliability and low transmission latency. Some problems are not easy to expose,

whether the domain-controlled DNS Set forwarding address problem, through the Discovery domain control DNS forwarding address for the Singapore address, the basic judgment is a problem, so change the forwarding address for the local ISP DNS, through the test client discovery, All resolved Baidu's IP is the mainland's Baidu server address, and the access speed and ping packets are normal.This troubleshooting let me on the domain control of some basic

before using Eclipse to test MAVEN's Web project, you can automatically publish your workspace's Web project code to "F:\IWorkspace\.metadata\" by clicking on "Clean" in the Eclipse internal Tomcat right button. Plugins\org.eclipse.wst.server.core\tmp2\wtpwebapps "This path is very convenient. If the war package deployed in Tomcat chooses the "Add External Web Module", then the test is going to cry. The MAV

Before using Eclipse to test MAVEN's Web project, you can automatically publish your workspace's Web project code to the F:\IWorkspace\.metadata\.plugins\ by clicking "Clean" on the inside of the Eclipse Tomcat right button. Org.eclipse.wst.server.core\tmp2\wtpwebapps "This path is very convenient. If the war package deployed in Tomcat chooses the "Add External Web Module", then the test is going to cry. Th