Internet slow on Ubuntu but not windows using a RTL8111

I have just installed a dual boot windows7 /ubuntu 11.10 and the internet is much slower than windows. I have read the post here and tried the solutions presented and none have worked.

Here is what I am dealing with; In Windows my internet is as normal, nice and fast.

However in ubuntu on my new system my internet is super slow (Here it is important to note that my other system ubuntu has the same speeds as windows on this system). I have installed all of the updates and am using the latest stable google chrome and my speedtest results are way lower. (upload times out and eventually fails, however before that happens ping is 10ms and download is <5meg). the difference is really felt when downloading anything, including updates.

My system specs are as follows:

 Motherboard: Asus P8Z68-V LX
 CPU:         Intel i5 2500k
 RAM:         Corsair vengeance blue 8GB (4X4GB)
 SSD:         OCZ Vertex 3 60gb

I am using the onboard lan. Drivers were installed from the CD provided with the motherboard. I installed the drivers in Windows (windows was installed first). Ubuntu did not require me to install any new drivers for the internet to work (and by work I mean I can get a connection, albeit intermittent and slow).

I have read people having difficulties with the UEFI BIOS but never internet speeds. Any help diagnosing my problem would be greatly appreciated.

rdl@rdl-home-ubuntu:~$ ethtool -s eth0 speed 1000 duplex full autoneg off
Cannot set new settings: Operation not permitted
  not setting speed
  not setting duplex
  not setting autoneg
rdl@rdl-home-ubuntu:~$ ifconfig eth0 |grep errors
          RX packets:14632 errors:0 dropped:14632 overruns:0 frame:14632
          TX packets:14094 errors:0 dropped:297 overruns:0 carrier:0

running the first command as sudo only changes Operation not permitted to Invalid argument

Here is the output of sudo 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: Symmetric Receive-only
    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: Symmetric Receive-only
    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

and after I run sudo ethtool -s eth0 speed 100 duplex full autoneg off

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:  Not reported
    Advertised pause frame use: No
    Advertised auto-negotiation: No
    Speed: 100Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: off
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000033 (51)
                   drv probe ifdown ifup
    Link detected: yes

Problem still persists.

Most probably you need to install the driver from here: http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false#2

The package comes with an install script.

As others have mentioned this is a known issue, try searching for "Realtek RTL8111".

Have you checked the basics

You are connected in 100 or 1000 in FULL DUPLEX ?

If you are running in half duplex, this is the problem

user@server:~$ sudo ethtool eth0
Settings for eth0:
    Supported ports: [ MII ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Speed: 100Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 1
    Transceiver: external
    Auto-negotiation: on
    Supports Wake-on: g
    Wake-on: g
    Link detected: yes

To change it (if your card support 1000, look at the Supported link modes line)

sudo ethtool -s eth0 speed 1000 duplex full autoneg off

Do you have network errors ?

user@server:~$ ifconfig eth0 |grep errors
          RX packets:1725783 errors:1 dropped:0 overruns:0 frame:1
          TX packets:1205465 errors:0 dropped:0 overruns:0 carrier:0