data path (travel) of tcp data from "write" syscall downto I/O registers programming

Posted by osgx on Stack Overflow See other posts from Stack Overflow or by osgx
Published on 2010-04-22T01:55:56Z Indexed on 2010/04/22 2:03 UTC
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linux-kernel

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networking

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latency

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tcp

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ip

Hello

Is there a good overview of tcp data path in Linux (2.6, not 2.4 if the path actually differ)? Where is a packet on different stages of tcp/ip stack handling?

How packet is packed to tcp segment, then ip packet. How it is transmitted to network card? (with series of I/O regs write and DMA?) Is it transmitted to network card in the "write" syscall handler (with some deep callstack) or is it transmitted at some other moment?

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