Date: Fri, 11 Mar 2005 08:49:04 -0800 From: Brooks Davis <brooks@one-eyed-alien.net> To: jim song <jingmin.song@gmail.com> Cc: freebsd-ipfw@freebsd.org Subject: Re: why my dummynet queue not work? Message-ID: <20050311164904.GA29287@odin.ac.hmc.edu> In-Reply-To: <d018391a050310213469df3025@mail.gmail.com> References: <d018391a050310200327a01c48@mail.gmail.com> <20050311043933.GA28686@odin.ac.hmc.edu> <d018391a050310213469df3025@mail.gmail.com>
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--PEIAKu/WMn1b1Hv9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable [Please don't top-post.] On Fri, Mar 11, 2005 at 01:34:10PM +0800, jim song wrote: > Brooks, >=20 > Actually I use the freebsd box as an router. I set the tcp window in=20 > another two windows box running iperf (iperf -w 5M). I'm pretty sure iperf only really sets the socket buffer size, not the tcp window size. In fact, that's what the help entry says: -w, --window #[KM] TCP window size (socket buffer size) =20 At least on FreeBSD the maximum window size is controlled by a global variable. You need to make sure you are setting both. If you want to use windows end-hosts, you'll need to ask a windows list what you need to do there. > Before I add in the pipes, the throughputs could reach 300M, but after > I config in the two pipes(200M bandwidth, 25ms delay), the throughput > degrade to about 5M.=20 That's expected. > BTW, is there some limitations to tcp connections passing through a=20 > router? No, dummynet doesn't know anything about TCP. -- Brooks > On Thu, 10 Mar 2005 20:39:33 -0800, Brooks Davis > <brooks@one-eyed-alien.net> wrote: > >=20 > > Why are you using the queue parameter at all? If you just want to > > emulate a pipe there is usually no need to do that. Have you adjusted > > your socket buffers in addition to your max TCP window size? > >=20 > > -- Brooks > > --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --PEIAKu/WMn1b1Hv9 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFCMcwAXY6L6fI4GtQRAvgbAKDQI1jGzYdfKVhJu2u5g5I1kbSJaACghhwu e4oTZgw1nDE2PNev3tuGM/Q= =0Zwd -----END PGP SIGNATURE----- --PEIAKu/WMn1b1Hv9--
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