Public bug reported: Installing bridge-utils and then setting up a bridge in /etc/netwrok/interfaces decimates my netwrok speed. Uninstalling the package and doing a reboot restores the speed.
This bug was originally posted here: https://bugs.launchpad.net/qemu/+bug/861141 but I now realise it is bridge-utils specific. Hardware: I have two identical machines (DELL poweredge R815), each with Broadcom NetXtreme II BCM57711 10-Gigabit PCIe connected via a 10G switch. Each machine runs 4 socket 12 core AMD Opteron(tm) Processor 6174 and 128GB of ram Software: Both machines ar running ubuntu server 10.04 lts Kernels are: Linux whitlam 2.6.32-28-server #55-Ubuntu SMP Mon Jan 10 23:57:16 UTC 2011 x86_64 GNU/Linux Linux fraser 2.6.32-28-server #55-Ubuntu SMP Mon Jan 10 23:57:16 UTC 2011 x86_64 GNU/Linux I have installed iperf on both machines. The tests here involve running whitlam as the iperf server and fraser as the client. On whitlam I run: bioadmin@whitlam:~# iperf -sm On fraser I run: bioadmin@fraser:~# iperf -c whitlam -d before installation I get: bioadmin@whitlam:~# iperf -sm ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 5] local 10.168.48.14 port 5001 connected with 10.168.48.13 port 37960 ------------------------------------------------------------ Client connecting to 10.168.48.13, TCP port 5001 TCP window size: 110 KByte (default) ------------------------------------------------------------ [ 6] local 10.168.48.14 port 49627 connected with 10.168.48.13 port 5001 Waiting for server threads to complete. Interrupt again to force quit. [ 5] 0.0-10.0 sec 10.8 GBytes 9.23 Gbits/sec [ 5] MSS size 1448 bytes (MTU 1500 bytes, ethernet) [ 6] 0.0-10.0 sec 10.6 GBytes 9.11 Gbits/sec [ 6] MSS size 1448 bytes (MTU 1500 bytes, ethernet) Which is nice. Next I run: sudo aptitude -y install bridge-utils and then I add a bridge to the interfaces file like thus: FROM: # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth4 iface eth4 inet static address xx.xx.xx.xx netmask 255.255.255.0 network xx.xx.xx.0 broadcast xx.xx.xx.255 gateway xx.xx.xx.1 # dns-* options are implemented by the resolvconf package, if installed dns-nameservers blah blah TO: # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface #auto eth4 #iface eth4 inet manual auto br0 iface br0 inet static address xx.xx.xx.13 netmask 255.255.255.0 network xx.xx.xx.0 broadcast xx.xx.xx.255 gateway xx.xx.xx.1 bridge_ports eth4 bridge_stp off # dns-* options are implemented by the resolvconf package, if installed dns-nameservers blah blah And restart networking sudo /etc/init.d/netwroking restart Which results in: bioadmin@whitlam:~# iperf -sm ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 4] local 10.168.48.14 port 5001 connected with 10.168.48.13 port 56405 ------------------------------------------------------------ Client connecting to 10.168.48.13, TCP port 5001 TCP window size: 1.25 MByte (default) ------------------------------------------------------------ [ 6] local 10.168.48.14 port 57001 connected with 10.168.48.13 port 5001 Waiting for server threads to complete. Interrupt again to force quit. [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.0 sec 10.5 GBytes 9.00 Gbits/sec [ 4] MSS size 1448 bytes (MTU 1500 bytes, ethernet) [ 6] 0.0-10.0 sec 2.51 GBytes 2.15 Gbits/sec [ 6] MSS size 1448 bytes (MTU 1500 bytes, ethernet) Note that the connection from the machine with bridge-utils installed (fraser) to the other machine (whitlam) is not affected. Only the connection from whitlam to fraser. Both machines are fresh installs with nfs-common, iperf installed. Fraser also has bridge-utils Any help is very much appreciated! ** Affects: bridge-utils (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bridge-utils in Ubuntu. https://bugs.launchpad.net/bugs/894608 Title: Implementing a bridge slows 10G network To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bridge-utils/+bug/894608/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs