From: "Ilpo Järvinen" <redacted>
Date: Mon, 2 Mar 2009 13:54:17 +0200 (EET)

We'll be dirty it anyway (not that I check), the first "real" statement
in tcp_rcv_established is:

	tp->rx_opt.saw_tstamp = 0;

...that'll land on the same dword. :-/

I suppose the blocks are there just because they had more complexity 
inside when they had to calculate the eff_sacks too (maybe it would
have been better to just remove them in that drop-patch so you would
have had less head-ache :-)).

That sounds like a good commit log entry for when you resubmit
this patch :-)