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The dreaded RTL8111/8168B, the r8168 driver and slow rates
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Zulon
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Joined: 26 Aug 2007
Posts: 5

PostPosted: Mon Feb 20, 2012 4:29 pm    Post subject: The dreaded RTL8111/8168B, the r8168 driver and slow rates Reply with quote

Hi everyone,

So I've got one of the infamous R8168 Realtek ethernet NIC, which have some problems under Linux. After some research, I found out I had to use the r8168 driver for this card (and not the r8169 which still loads when nothing else is available), which I did. So now everything works fine... Sort of.

My download and upload rates are more than halved compared to what I should get. When I test (with eg. speedtest) I get something like 20M (often 15M) in download and 30M in upload, but if I test under Windows (everything is otherwise identical: same ethernet cable, same connection, at the same time of the day (well 5 min apart)...), I get 50M upload/download (which is what I expect). Where can it come from? Here is the relevant info (if you need more, ask, this is all I can think of):

Code:
~ # lspci -v
[...]
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
        Subsystem: Dell Device 04b6
        Flags: bus master, fast devsel, latency 0, IRQ 44
        I/O ports at 2000 [size=256]
        Memory at f1804000 (64-bit, prefetchable) [size=4K]
        Memory at f1800000 (64-bit, prefetchable) [size=16K]
        Capabilities: [40] Power Management version 3
        Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Endpoint, MSI 01
        Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
        Capabilities: [d0] Vital Product Data
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Virtual Channel
        Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
        Kernel driver in use: r8168
        Kernel modules: r8168

~ # modinfo r8168
filename:       /lib/modules/3.2.1-gentoo-r2/net/r8168.ko
version:        8.028.00-NAPI
license:        GPL
description:    RealTek RTL-8168 Gigabit Ethernet driver
author:         Realtek and the Linux r8168 crew <netdev@vger.kernel.org>
srcversion:     638662AC20F4563725136BB
alias:          pci:v00001186d00004300sv00001186sd00004B10bc*sc*i*
alias:          pci:v000010ECd00008168sv*sd*bc*sc*i*
depends:       
vermagic:       3.2.1-gentoo-r2 SMP mod_unload
parm:           eee_enable:int
parm:           speed:force phy operation. Deprecated by ethtool (8). (array of int)
parm:           duplex:force phy operation. Deprecated by ethtool (8). (array of int)
parm:           autoneg:force phy operation. Deprecated by ethtool (8). (array of int)
parm:           rx_copybreak:Copy breakpoint for copy-only-tiny-frames (int)
parm:           use_dac:Enable PCI DAC. Unsafe on 32 bit PCI slot. (int)
parm:           debug:Debug verbosity level (0=none, ..., 16=all) (int)

~ # mii-tool -v
eth0: negotiated 100baseTx-FD, link ok
  product info: vendor 00:07:32, model 17 rev 4
  basic mode:   autonegotiation enabled
  basic status: autonegotiation complete, link ok
  capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
  advertising:  100baseTx-HD 10baseT-FD 10baseT-HD flow-control
  link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

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

~ # ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 14:fe:b5:c2:2f:c8 
          inet addr:129.199.157.73  Bcast:129.199.159.255  Mask:255.255.252.0
          inet6 addr: fec0::a:16fe:b5ff:fec2:2fc8/64 Scope:Site
          inet6 addr: 2002:81c7:9d52:a:16fe:b5ff:fec2:2fc8/64 Scope:Global
          inet6 addr: fec0::b:16fe:b5ff:fec2:2fc8/64 Scope:Site
          inet6 addr: 2002:81c7:9f0f:b:16fe:b5ff:fec2:2fc8/64 Scope:Global
          inet6 addr: fe80::16fe:b5ff:fec2:2fc8/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:931762 errors:0 dropped:89 overruns:0 frame:0
          TX packets:558162 errors:0 dropped:4 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1083491129 (1.0 GiB)  TX bytes:141377763 (134.8 MiB)
          Interrupt:44 Base address:0xe000

~ # uname -a
Linux catamorphisme 3.2.1-gentoo-r2 #1 SMP Fri Jan 27 17:41:11 CET 2012 x86_64 Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz GenuineIntel GNU/Linux
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