27.09.2015, 15:26, "Bjoern A. Zeeb" <b...@freebsd.org>: > On Sun, 27 Sep 2015, Alexander V. Chernikov wrote: > >> Author: melifaro >> Date: Sun Sep 27 05:29:34 2015 >> New Revision: 288301 >> URL: https://svnweb.freebsd.org/changeset/base/288301 >> >> Log: >> Eliminate nd6_nud_hint() and its TCP bindings. >> >> Initially function was introduced in r53541 (KAME initial commit) to >> "provide hints from upper layer protocols that indicate a connection >> is making "forward progress"" (quote from RFC 2461 7.3.1 Reachability >> Confirmation). >> However, it was converted to do nothing (e.g. just return) in r122922 >> (tcp_hostcache implementation) back in 2003. Some defines were moved >> to tcp_var.h in r169541. Then, it was broken (for non-corner cases) >> by r186119 (L2<>L3 split) in 2008 (NULL ifp in nd6_lookup). So, >> right now this code is broken and has no "real" base users. >> >> Differential Revision: https://reviews.freebsd.org/D3699 > > PR: 165692 > > It would be nice to have the feature back though it would be very > expensive locking wise if it'd remain a per-packet operation. It looks like there are options to implement this without significant overhead (like, on proper TCP session teardown, or on delayed-ack timer, or/and with some sort of sampling + special "no-gw" flag). I'd prefer not to shift my focus from projects/routing now, but I can cooperate with someone from TCP side and resurrect/test nd6_nud_hint()
> > -- > Bjoern A. Zeeb "Come on. Learn, goddamn it.", WarGames, 1983 _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
