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Thread: Jumbo Frames on Realtek RTL8111/8168B (9k MTU) fails poor performance

  1. #1
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    Cool Jumbo Frames on Realtek RTL8111/8168B (9k MTU) fails poor performance

    Hello

    I am having issues with my Ubuntu server - Windows and Opensolaris drivers allowed the network card to use JUMBO FRAMES (9k MTU). Ubuntu it seems like it is not working.

    I have a gigabit LAN at home, and on the other operating systems I used to be able to push data at 60MB/s rates. Today 20MBPS.

    I found the problem by querying eth0 it had MTU = 1500. So I tried to enable 9k mtu as my windows computer so I can transfer files.

    The MTU will not go any higher than 7000, this is a problem because I was able to set it to 9000 and I know its supported.

    Here is the information, thanks in advance:

    giovanni@Gserver:~$ lspci -v | grep Gigabit
    04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
    giovanni@Gserver:~$ modprobe r8111
    FATAL: Module r8111 not found.
    giovanni@Gserver:~$ modprobe r8168
    FATAL: Module r8168 not found.
    giovanni@Gserver:~$ ethtool -i eth0
    driver: r8169
    version: 2.3LK-NAPI
    firmware-version:
    bus-info: 0000:04:00.0
    giovanni@Gserver:~$ ethtool -k eth0
    Offload parameters for eth0:
    rx-checksumming: on
    tx-checksumming: off
    scatter-gather: off
    tcp-segmentation-offload: off
    udp-fragmentation-offload: off
    generic-segmentation-offload: off
    generic-receive-offload: off
    large-receive-offload: off
    ntuple-filters: off
    receive-hashing: off
    giovanni@Gserver:~$


    giovanni@Gserver:~$ modprobe r8169
    giovanni@Gserver:~$ ifconfig eth0 mtu 9000
    SIOCSIFMTU: Operation not permitted
    giovanni@Gserver:~$ ifconfig eth0
    eth0 Link encap:Ethernet HWaddr 00:e0:4d:98:26:ca
    inet addr:192.168.0.254 Bcast:192.168.0.255 Mask:255.255.255.0
    inet6 addr: fe80::2e0:4dff:fe98:26ca/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:7000 Metric:1
    RX packets:290016576 errors:0 dropped:0 overruns:0 frame:0
    TX packets:168049038 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:401221331399 (401.2 GB) TX bytes:44396953701 (44.3 GB)
    Interrupt:46 Base address:0xe000

    giovanni@Gserver:~$


    root@Gserver:/home/giovanni/Downloads# lsmod | grep r816
    r8169 42222 0
    mii 5261 1 r8169
    root@Gserver:/home/giovanni/Downloads#
    Last edited by Francisco; November 23rd, 2010 at 03:28 AM.

  2. #2
    Join Date
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    Ubuntu 13.04 Raring Ringtail

    Re: Jumbo Frames on Realtek RTL8111/8168B (9k MTU) fails poor performance

    I have the same problem on 3 different systems with 6 different network cards running 11.04 x64.

    Will not go over 7000.

    Is there a launchpad bug on this?

  3. #3
    Join Date
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    Ubuntu 13.04 Raring Ringtail

    Re: Jumbo Frames on Realtek RTL8111/8168B (9k MTU) fails poor performance


  4. #4
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    Distro
    Kubuntu Development Release

    Re: Jumbo Frames on Realtek RTL8111/8168B (9k MTU) fails poor performance

    For what it's worth, the limit is 7200 not 7000. I've not solved this, but mine is at 7200 right now and not performing like it should be. Sometimes I actually see better performance when set to 1500.

    Also, the bug report went stale. :-/ I know they get far more bug reports than they can handle, but just because no one has commented on it doesn't mean it's not still a bug.
    kubuntu user since 7/2006

  5. #5
    Join Date
    Jan 2010
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    Re: Jumbo Frames on Realtek RTL8111/8168B (9k MTU) fails poor performance

    Quote Originally Posted by clickwir View Post
    For what it's worth, the limit is 7200 not 7000.
    Code:
    02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 06)
    This one can't do 7000, 6000 is ok.

    (Old Asrock Vision 3d)

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