Andy Furniss wrote:
I've been doing some testing of my new wan connection and noticed that
when I specify a window with ip route it still changes after a while.
Looks like this is occurring in net/ipv4/tcp_input.c:tcp_rcv_space_adjust().
The problem really is that the window_clamp variable is overloaded.
It's used as a kind of cache for rcvbuf -> window conversion, but also
as a user-settable bound in window size. On examination, it looks like
this is also broken (in that window size won't increase) if a user does
a setsockopt(SO_RCVBUF). Can we make window_clamp a true clamp? Then
we can get rid of the hack of raising it in tcp_rcv_space_adjust(). I
can cook up a patch if interested.
-John
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