John, have a look at this code in tcp_write_timeout():
mss = min(sysctl_tcp_base_mss,
tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low)/2);
mss = max(mss, 68 - tp->tcp_header_len);
That first line looks like it should be a max() instead
of a min().
tcp_base_mss is the smallest MSS we should use, therefore
we should make sure the "mss" is at least that large.
It's also possible that I misread the intention of this code :) From
what I read, it is trying to half the MSS in use and adjust the MTU
search low point to be based upon this new value.
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