What is the cost of a system call(send the 2nd time)

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 Howdy,

 Now, I am trying to estimate what the cost of a system call, To be more accurate,
how many instructions have to be executed in average.
 
 To what extent dose the cost diff  among different platforms?

 So many high-perf communication systems are implemented in user space, just to bypass
all kinds of system calls. Could we make a thin system-call-layer to ease the life of 
guys in these efforts?

 
 TIA.

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  I18n of linux is necessary now. I want to contribute to it.


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