Date: Wed, 29 Jul 2009 14:17:08 +0400 From: Anthony Pankov <ap00@mail.ru> To: freebsd-net@freebsd.org Subject: TCP initial window size Message-ID: <98265976953.20090729141708@mail.ru>
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Can anybody explain me about initial TCP window sent to the client (in syn/ack packet), please. Is it unmanageable and always set to net.inet.tcp.recvspace? (Due to use of syncache and syncache code is (tcp_syncache.c): /* Initial receive window: clip sbspace to [0 .. TCP_MAXWIN] */ win = sbspace(&so->so_rcv); win = imax(win, 0); win = imin(win, TCP_MAXWIN); sc->sc_wnd = win; ) If it is, then what bad things will happen if i replace code above by code like this: if (tcp_do_rfc3390) sc->sc_wnd = min(4*(sc->sc_peer_mss ? sc->sc_peer_mss:tcp_mssdflt ), max(2 * (sc->sc_peer_mss ? sc->sc_peer_mss:tcp_mssdflt), 4380)); else sc->sc_wnd = (sc->sc_peer_mss ? sc->sc_peer_mss:tcp_mssdflt) * ss_fltsz; Also, does local connection use syncache? System: FreeBSD 6.2-RELEASE-p9 -- Best regards, Anthony mailto:ap00@mail.ru
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