tcp window concept

[Varun Sharma]

Hi,

I am sending 5000 bytes of data in send system call.
struct tcp_sock has max_window and snd_wnd two variable.Which are increase
as packet sent out . whereas tcp header window variable value is fix for
all packets.can anyone tell what is relationship b/w these windows ? and
why max_window and snd_wnd size increase after packets  sent out ?
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