otn switching

L2 switches generally use the CAM table in the hardware chip of ASIC (Application Specific Integrated Circuit, dedicated IC, therefore, the forwarding performance is very high. The layer-3 forwarding of a layer-3 Switch relies on the ASIC chip (the router's routing function depends mainly on the CPU software). However, apart from the CAM table used for layer-2 switching, A three-tier hardware Forwarding Table dedicated for layer-3 Forwarding is also s

Process switching in Linux kernel Linux switching does not use the X86cpu switching method, the essence of Linux switching is CR3 switching (memory space switching, in the SWITCH_MM function) + register

The eighth week process switchover and the system's general execution process by 135217 Sun Xiaobo this week's main content: Basic concepts and related knowledge of process scheduling in Linux How the schedule function implements process scheduling Implementation process of Linux processes (general and special cases) Macro Description Linux System execution The main code of the process switch switch_to the scheduling time of the process and the process

Review Status of this memo This article is a draft of the Internet. The draft Internet is the working document for the Internet Engineering task Force (IETF) and the areas and workgroups it covers. Note that other workgroups can also publish working documents as Internet drafts. The Internet draft is valid for a maximum of 6 months, a draft document that is likely to be modified, replaced or repealed at any time by other documents. It is not appropriate to use the Internet draft as a referenc

In daily operation in order to avoid some mis-operation, more secure management system, usually use the user identity is ordinary users, not root. When you need to perform some administrator command operation, then switch to the root user to execute.The way a normal user switches to the root user is: Su and sudo.1 , Su-(su is switch user, which is shorthand for switching users)Format:su-l USERNAME(-l for login, that is, shorthand for landing)-L can om

Command form:pushd [dir | +n |-n] [-n]1. The pushd command without parameters will exchange two directories at the top of the directory stack, equivalent to using the cd– command.2. The stack bottom of the directory stack holds the working directory when the pushd command is executed when the directory stack is empty.3, the function of the parameter N is to iterate the directory stack, the nth entry loop in the directory stack is moved to the top of the stack, the entry of the top of the stack w

(process B) before switching out from B: actually loading NEXT->THREAD.ESP into ESP"MOVL%[NEXT_SP],%%ESP/N/T"/* Restore ESP */It can be expressed as: esp_bNote that next in the a process is the process descriptor that points to B.From this point on, the current process of CPU execution is already a B process, because ESP already points to B's kernel stack. However, the current EBP still points to the kernel stack of the a process, so all local variab

1. The command for user Switching in the Linux system is SU, and the syntax is:su [-FMP] [-C command] [-s Shell] [--help] [--version] [-] [USER [ARG]]Parameter description-F, –fast: Do not need to read the boot file (such as CSH.CSHRC, etc.), only for CSH or tcsh two kinds of shell.-L, –login: After this parameter is added, it is as if it were re-landed, most of the environment variables (such as home, shell, user, etc.) are based on the user, andand

How does the Linux operating system on VMware virtual machines perform tty1~tty6 switching?Phenomenon:The switching hotkeys between the Linux terminal (text) interface and the graphical interface are:Entering the terminal is the character interface (TTY1-TTY6): [Ctrl] + [Alt] + [F1]-[F6]Enter the graphical interface (TTY7): [Ctrl] + [Alt] + [F7]Linux systems that can be installed on VMware Workstation are n

Interface SwitchingIn the project can be a high degree of coupling of the interface through a storyboard, can be used in accordance with the function of multiple storyboard interface, so as to facilitate project maintenance and multi-person development, for multiple storyboard switching between, you can use the following code:@IBAction func Changeone (Sender:uibutton) { var onestoryboard:uistoryboard = uistoryboard (name: "One", Bundle: Nsbundl