Overview and functions of NOP commands and roles of NOP commands
/*************************************** ******************************* Author: Samson* Date: 08/03/2014* Test platform:* Linux ubuntu 3.2.0-58-generic-pae* GNU bash, version 4.2.39***
/*************************************** ******************************* Author: Samson* Date: 08/03/2014* Test Platform:* Linux Ubuntu 3.2.0-58-generic-pae* GNU bash, version 4.2.39**************************************** ***************************
ASM ("NOP") is an inline assembler short instruction delay, in which the function of ASM () refers to the internal parameters of functions translated into assembly instructions, the role is in the C language environment directly using assembly
In the past, the three-way handshake of TCP stayed at the level of three arrows. now, with the help of tcpdump, we can clearly see how TCP established connections and transmitted data. I first ran the TCP bounce server program on the UNP book, asked
By understanding the status of TCP, We Can troubleshoot and locate network or system faults.
I. TCP status
Listening: listens for connection requests from remote TCP ports.
First, the server needs to open a socket for listening, and the status is
TCP connection status explanation and troubleshooting
By understanding the status of TCP, We Can troubleshoot and locate network or system faults. (Summarize the content on the Network)
1. TCP status
LISTENING: listens for connection requests from
Tcpdump Grab Bag Tool One: tcpdump introduction? Tcpdump can intercept the "head" of the packets that are transmitted in the network to provide analysis. It supports filtering on the network layer, protocol, host, network, or port, and provides
Web Product performance Testing, there are many TCP connection problems, but also because of this problem, resulting in performance instability and so on, the data transmission between the client and server, and the transition between the connection
Does the REP;NOP command execute multiple NOP or 1 NOP?
Originally, adding the rep prefix is the rep instruction until the ECX value is 0. In the kernel code, as in the Spin_lock implementation, you will see REP;NOP such a statement, it is easy to
12.ARM Pseudo-instruction operationFirst arm pseudo-directives include:
Arm machine code
Defining class pseudo-directives
Operation class Pseudo-directives
?Arm Machine code:In fact, any kind of processor can be run called
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