packet loss analyzer

Summary of delay commands for simulating packet loss in centosSummary of delay commands for simulating packet loss in linux:First, run the ifconfig command.1. Set latencyLatency: sudo tc qdisc add dev eth0 root netem delay 30 msLatency in the range (10-50 ms): sudo tc qdisc add dev eth0 root netem delay 30 ms 20 msSet

# throughput = byte CNT/Time Interval # Time Interval = cur_time-start_timebegin {# program initializeinit = 0; I = 0 ;} {Action = $1; time = $2; from = $3; To = $4; type = $5; pktsize = $6; flow_id = $8; src = $9; DST = $10; seq_no = $11; packet_id = $12; if (Action = "R" from = 2 to = 3 flow_id = 2) {pkt_byte_sum [I + 1] = pkt_byte_sum [I] + pktsize; If (init = 0) {start_time = time; init = 1;} end_time [I] = time; I = I + 1 ;}}end {# when read over, start to calculateprintf ("%. 2f \ t %.

, 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

http://view.inews.qq.com/a/20161025A0766200QQ in narrowband eraQQ is a narrow band of the most representative of the product, in that network transmission efficiency is lower than the era, we still remember Google's homepage? Why is the simple page of Google so concise?Google was born in 1998, is also in the narrow-band era, you will find its home byte size is less than 1024, why less than 1024 bytes, because the Ethernet MTU (that is, the largest transmission unit) is 1024,google in order to le

Transferred from: http://blog.csdn.net/wanggp_2007/article/details/5136609Packet loss compensation (Packet Loss CONCEALMENT--PLC) is a very important technology in ILBC codec, and it is an indispensable part of VoIP codec applications. The ILBC PLC only handles packet compensation at the decoding end. In the decoding e

H3C s5500 is the core and is linked to the s3100 of adjacent buildings. The user reports that the client network in 3100 is unstable. Link mode (5500) network cable (3100 MB photoelectric conversion) optical fiber to adjacent building (MB photoelectric conversion) network cable) First Ping, occasionally packet loss of 3%-5%, and occasionally good .. Strange Check whether the ports 3100 and 5500 are config

By the 3 (in fact, 2) the problem of the pit miserable, there is no problem of missing packets, previously thought that the problem of packet loss is not present.The case of sticky and broken packets is present, these two problems are not afraid, as long as the sending received packet order is not disrupted upside down, everything is good.Easy-to-drop pits: Accep

Today in the company asked the boss, the company's project Bottom, is the use of TCP, because of reliable, automatic disconnection, in the bottom of the implementation, but I remember TCP will also have a swap problem, so this article was born--on the problem of TCP swap, TCP is based on unreliable networks to achieve reliable transmission, There is certainly a case for the substitution.If there is missing data or drops in the communication, the most likely problem is the process of sending the

Bandwidth or flow rate unit: Kbps Kbyte/sec Kilobytes per second Mbps Mbyte/sec Megabytes per second Kbit Kbits/sec Mbit Mbits/sec 1 , Analog Delay Transfer# TC Qdisc Add dev eth0 root netem delay 100msThis command sets the transmission of the eth0 NIC to a delay of 100 milliseconds to send.In a more realistic case, the delay value will not be so accurate, there will be a certain flu

Clone Zabbix's own template ICMP ping templates 650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M01/86/F3/wKioL1fPrcLi2YxjAAByYarcCOM203.jpg-wh_500x0-wm_3 -wmp_4-s_2806794333.jpg "title=" ping 202.96.209.5.jpg "alt=" Wkiol1fprcli2yxjaabyyarccom203.jpg-wh_50 "/>Here I make a network delay template to 202.96.209.5 Shanghai DNS650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M02/86/F3/wKioL1fPrnnS2DkyAACNTuKAcik725.jpg-wh_500x0-wm_3 -wmp_4-s_2264462392.jpg "title=" qq2016090714062

FEC (Forward error Correction) forward error correction UDP\RTP used to improve wireless and other network packet loss problems The algorithm is not introduced at this stage. Idea: FEC ENCODE adds redundant packets, and when the wireless network drops packets, the receiver uses redundant packets to decode the lost packets. Example: 10 packets, the code will add 2 packets, a total of 12 packets sent to th

Cause Analysis of UDP packet loss in linux kernel 1. UDP checksum and error phenomenon: You can use netstat-su to view UDP error packets. Tcpdump packet capture: Enable the captured udp packet in wireshark and enable the checksum option. Solution: Search for Link faults www.2cto.com 2. Firewall enabling phenomenon: pac

the connection, The connection pool considers the connection to be valid (because the validity of the connection is not verified), which results in an error when the application requests the connection. 3. Workaround: A. Follow the wrong prompts, you can use the AutoReConnect property in the JDBC URL, here is my configuration Jdbc:mysql://localhost:3306/anxincar? autoreconnect=true Where the red part is the newly added property settingHowever, there is another version of the Internet, it has be

The performance of the test system in Linux has found that the packet loss rate is extremely serious. It sends 210000 pieces of data, and the packet loss rate reaches 110000. The packet loss rate exceeds 50%. In the same case, onl

1 Try {2 //send data to the specified IP and port ~ ~ 3 //let's explain who sent the data! 4 byte[] IP =inetaddress.getlocalhost (). Gethostaddress (). GetBytes ();5DP =Newdatagrampacket (IP, ip.length, Sendiad, Qqreceive.getport ());6 Ds.send (DP);7 8 //this is mainly due to the fact that multiple datagram packets are sent when the pa