Hi, I'm experiencing some mysterious transfer speed differences. I have a virtual Linux-server at HostEurope, Germany, and it appears that machines running OpenBSD can only download from the Linux-server with approx 300 kB/s, whereas machines running Linux can download with approx 1.5 MB/s from the server.
I have conducted a small test to clarify what I'm talking about. The involved machines: - sauerkraut.obsd.dk (87.230.22.203) (Debian GNU/Linux, 2.6.9 kernel). - gw.obelnet.dk (130.225.243.84) (OpenBSD 4.2-stable). - matrix.math.aau.dk (130.225.48.12) (Ubuntu Linux, 2.6.20 kernel). sauerkraut.obsd.dk is the server at HostEurope, and it offers a 50 MB download at http://obsd.dk/50MB, which I'll download from the other two machines. gw.obelnet.dk: [EMAIL PROTECTED]:~$ wget -O /dev/null http://obsd.dk/50MB --21:03:22-- http://obsd.dk/50MB => `/dev/null' Resolving obsd.dk... 87.230.22.203 Connecting to obsd.dk|87.230.22.203|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 52,428,800 (50M) [text/plain] 100%[====================================>] 52,428,800 334.12K/s ETA 00:00 21:05:57 (331.55 KB/s) - `/dev/null' saved [52428800/52428800] matrix.math.aau.dk: [EMAIL PROTECTED]:~$ wget -O /dev/null http://obsd.dk/50MB --21:06:45-- http://obsd.dk/50MB => `/dev/null' Resolving obsd.dk... 87.230.22.203 Connecting to obsd.dk|87.230.22.203|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 52.428.800 (50M) [text/plain] 100%[====================================>] 52.428.800 1.59M/s ETA 00:00 21:07:17 (1.56 MB/s) - `/dev/null' saved [52428800/52428800] I have attached three traceroutes -- from gw.obelnet.dk to sauerkraut.obsd.dk, from matrix.math.aau.dk to sauerkraut.obsd.dk, and from gw.obelnet.dk to matrix.math.aau.dk. The last one illustrates how close gw.obelnet.dk and matrix.math.aau.dk are located, network wise. Both are connected through Aalborg University, which is connected through the Danish Network for Research and Education, which again is connected through NORDUnet (a collaboration between nordic research networks). What baffles me most is that when I make a ssh tunnel from gw.obelnet.dk through matrix.math.aau.dk to sauerkraut.obsd.dk, I can download the 50 MB file with approx 1.5 MB/s: [EMAIL PROTECTED]:~$ grep obsd.dk /etc/hosts 127.0.0.1 localhost.obelnet.dk localhost obsd.dk [EMAIL PROTECTED]:~$ ssh -N -L 4000:obsd.dk:80 matrix.math.aau.dk & [EMAIL PROTECTED]:~$ wget -O /dev/null http://obsd.dk:4000/50MB --21:26:23-- http://obsd.dk:4000/50MB => `/dev/null' Resolving obsd.dk... 127.0.0.1 Connecting to obsd.dk|127.0.0.1|:4000... connected. HTTP request sent, awaiting response... 200 OK Length: 52,428,800 (50M) [text/plain] 100%[====================================>] 52,428,800 1.47M/s ETA 00:00 21:26:55 (1.54 MB/s) - `/dev/null' saved [52428800/52428800] Beside the test above, I have also downloaded the 50 MB file from a Linux box (Debian GNU/Linux, 2.6.x kernel) and an OpenBSD box (4.2-current), both directly behind gw.obelnet.dk. gw.obelnet.dk is a NAT gateway for the two boxes, as you might have guessed. The numbers from above are confirmed -- the Linux box downloads with 1-1.5 MB/s, and the OpenBSD box downloads with 270-300 kB/s. Can anybody explain these differences? Why are the downloads so slow on OpenBSD? Any help is appreciated. If you think I've left something important out, don't hesitate to ask. Best regards, Martin Attachments: Traceroute from gw.obelnet.dk to sauerkraut.obsd.dk: [EMAIL PROTECTED]:~$ traceroute -P 1 sauerkraut.obsd.dk traceroute to sauerkraut.obsd.dk (87.230.22.203), 64 hops max, 60 byte packets 1 gi1-0-1.aalborg1.aau.dk (130.225.243.65) 0.769 ms 0.814 ms 0.802 ms 2 icdata.ly4.core.fsknet.dk (130.225.242.34) 6.758 ms 6.392 ms 6.606 ms 3 teng-ly4.ly3.core.fsknet.dk (130.225.244.145) 6.275 ms 6.634 ms 6.683 ms 4 10g-ly3.or1.core.fsknet.dk (130.225.244.218) 6.615 ms 7.184 ms 6.924 ms 5 dk-ore.nordu.net (193.10.68.121) 6.791 ms 6.726 ms 6.608 ms 6 se-fre.nordu.net (193.10.68.117) 16.359 ms 16.418 ms 16.604 ms 7 s-b3-link.telia.net (213.248.97.17) 20.683 ms 20.695 ms 17.285 ms 8 s-bb1-link.telia.net (80.91.254.58) 20.385 ms 20.360 ms 16.842 ms 9 ffm-bb1-link.telia.net (80.91.251.145) 43.569 ms 44.25 ms 47.294 ms 10 ffm-b1-link.telia.net (80.91.254.97) 47.347 ms 47.275 ms 47.236 ms 11 pipex-115772-ffm-b1.c.telia.net (213.248.102.158) 51.53 ms 54.802 ms 50.290 ms 12 xe-6-1-0.juwel.cgn3.hosteurope.de (80.237.129.114) 49.954 ms 49.954 ms 50.155 ms 13 xe-16-1.mlx31m.cgn3.hosteurope.de (80.237.129.118) 44.355 ms 43.938 ms 47.882 ms 14 * * * 15 sauerkraut.obsd.dk (87.230.22.203) 44.167 ms 43.965 ms 47.766 ms Traceroute from matrix.math.aau.dk to sauerkraut.obsd.dk: [EMAIL PROTECTED]:~$ traceroute -I sauerkraut.obsd.dk traceroute to sauerkraut.obsd.dk (87.230.22.203), 30 hops max, 40 byte packets 1 ciscoa (130.225.48.254) 1.044 ms 1.006 ms 1.015 ms 2 gi-gw4.aalborg2.aau.dk (192.38.59.2) 0.430 ms 0.402 ms 0.401 ms 3 icdata.ly4.core.fsknet.dk (130.225.242.34) 6.045 ms 6.054 ms 6.034 ms 4 teng-ly4.ly3.core.fsknet.dk (130.225.244.145) 5.978 ms 5.972 ms 5.959 ms 5 10g-ly3.or1.core.fsknet.dk (130.225.244.218) 6.483 ms 6.506 ms 6.471 ms 6 dk-ore.nordu.net (193.10.68.121) 6.421 ms 6.432 ms 6.403 ms 7 se-fre.nordu.net (193.10.68.117) 16.172 ms 16.182 ms 16.147 ms 8 s-b3-link.telia.net (213.248.97.17) 32.140 ms 20.068 ms 16.418 ms 9 s-bb1-link.telia.net (80.91.254.58) 20.093 ms 16.391 ms 20.038 ms 10 ffm-bb1-link.telia.net (80.91.251.145) 47.058 ms 47.037 ms 47.074 ms 11 ffm-b1-link.telia.net (80.91.254.97) 47.108 ms 47.017 ms 43.327 ms 12 pipex-115772-ffm-b1.c.telia.net (213.248.102.158) 49.744 ms 49.727 ms 46.568 ms 13 xe-6-1-0.juwel.cgn3.hosteurope.de (80.237.129.114) 59.206 ms 55.756 ms 46.009 ms 14 xe-16-1.mlx31m.cgn3.hosteurope.de (80.237.129.118) 43.659 ms 43.619 ms 47.294 ms 15 * * * 16 sauerkraut.obsd.dk (87.230.22.203) 47.355 ms 47.274 ms 43.667 ms Traceroute from gw.obelnet.dk to matrix.math.aau.dk: [EMAIL PROTECTED]:~$ traceroute -P 1 matrix.math.aau.dk traceroute to matrix.math.aau.dk (130.225.48.12), 64 hops max, 60 byte packets 1 gi1-0-1.aalborg1.aau.dk (130.225.243.65) 0.573 ms 0.658 ms 0.821 ms 2 gi1-1.aau-gw1.aau.dk (192.38.59.65) 0.558 ms 0.567 ms 0.527 ms 3 aau-gw4.auc.dk (130.225.52.11) 1.243 ms 1.717 ms 1.72 ms 4 matrix.math.aau.dk (130.225.48.12) 0.575 ms 0.690 ms 0.762 ms
