KVM - Slow network

Discussion in 'HOWTO-Related Questions' started by kramse, May 23, 2011.

  1. kramse

    kramse New Member

    Hi,

    Followed the guide kvm on ubuntu 11.04, all works ok, however..
    Network speeds are slow max 10Mb/s from both host and guest.
    I use the br0 to my guests. Any suggestions are very welcome.

    Here are my config files:
    cat /etc/network/interfaces
    # 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 eth0
    iface eth0 inet manual

    auto br0
    iface br0 inet static
    address 192.168.0.253
    network 192.168.0.0
    netmask 255.255.255.0
    broadcast 192.168.0.255
    gateway 192.168.0.254
    bridge_ports eth0
    bridge_fd 9
    bridge_hello 2
    bridge_maxage 12
    bridge_stp off


    iptables -t nat -L
    Chain PREROUTING (policy ACCEPT)
    target prot opt source destination

    Chain INPUT (policy ACCEPT)
    target prot opt source destination

    Chain OUTPUT (policy ACCEPT)
    target prot opt source destination

    Chain POSTROUTING (policy ACCEPT)
    target prot opt source destination
    MASQUERADE tcp -- 192.168.122.0/24 !192.168.122.0/24 masq ports: 1024-65535
    MASQUERADE udp -- 192.168.122.0/24 !192.168.122.0/24 masq ports: 1024-65535
    MASQUERADE all -- 192.168.122.0/24 !192.168.122.0/24


    ifconfig
    br0 Link encap:Ethernet HWaddr 00:0a:cd:18:ad:32
    inet addr:192.168.0.253 Bcast:192.168.0.255 Mask:255.255.255.0
    inet6 addr: fe80::20a:cdff:fe18:ad32/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:17264 errors:0 dropped:0 overruns:0 frame:0
    TX packets:108219 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:1267774 (1.2 MB) TX bytes:149864651 (149.8 MB)

    eth0 Link encap:Ethernet HWaddr 00:0a:cd:18:ad:32
    inet6 addr: fe80::20a:cdff:fe18:ad32/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:18176 errors:0 dropped:0 overruns:0 frame:0
    TX packets:109158 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:1671407 (1.6 MB) TX bytes:150010899 (150.0 MB)
    Interrupt:19

    lo Link encap:Local Loopback
    inet addr:127.0.0.1 Mask:255.0.0.0
    inet6 addr: ::1/128 Scope:Host
    UP LOOPBACK RUNNING MTU:16436 Metric:1
    RX packets:0 errors:0 dropped:0 overruns:0 frame:0
    TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

    virbr0 Link encap:Ethernet HWaddr 9e:c9:3b:db:ac:d4
    inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:0 errors:0 dropped:0 overruns:0 frame:0
    TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:0
    RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

    vnet0 Link encap:Ethernet HWaddr fe:54:00:cc:bc:f3
    inet6 addr: fe80::fc54:ff:fecc:bcf3/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:273 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1354 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:500
    RX bytes:31414 (31.4 KB) TX bytes:206452 (206.4 KB)

    vnet1 Link encap:Ethernet HWaddr fe:54:00:9b:f4:a2
    inet6 addr: fe80::fc54:ff:fe9b:f4a2/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:757 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1961 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:500
    RX bytes:124525 (124.5 KB) TX bytes:274612 (274.6 KB)


    ethtool eth0
    Settings for eth0:
    Supported ports: [ TP MII ]
    Supported link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Half 1000baseT/Full
    Supports auto-negotiation: Yes
    Advertised link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Half 1000baseT/Full
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Link partner advertised link modes: 10baseT/Half 10baseT/Full
    100baseT/Half 100baseT/Full
    1000baseT/Full
    Link partner advertised pause frame use: No
    Link partner advertised auto-negotiation: Yes
    Speed: 1000Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000033 (51)
    drv probe ifdown ifup
    Link detected: yes




    lspci
    00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 10)
    00:02.0 VGA compatible controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 10)
    00:1c.0 PCI bridge: Intel Corporation N10/ICH 7 Family PCI Express Port 1 (rev 01)
    00:1d.0 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #1 (rev 01)
    00:1d.1 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #2 (rev 01)
    00:1d.2 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #3 (rev 01)
    00:1d.3 USB Controller: Intel Corporation N10/ICH 7 Family USB UHCI Controller #4 (rev 01)
    00:1d.7 USB Controller: Intel Corporation N10/ICH 7 Family USB2 EHCI Controller (rev 01)
    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1)
    00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01)
    00:1f.2 IDE interface: Intel Corporation N10/ICH7 Family SATA IDE Controller (rev 01)
    00:1f.3 SMBus: Intel Corporation N10/ICH 7 Family SMBus Controller (rev 01)
    02:01.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)
     
  2. kramse

    kramse New Member

    Uninstalled bridge-utils and getting full speed now....
     
: br0, kvm, network, slow

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