I can confirm this bug.
If i configure my network connection manually (via
/etc/network/interfaces), I get consistent speeds as expected in a
100Mb/s LAN.
However, if I use network-manager instead, speeds drop down to barely 2 MB/s.
This could be explained by the following messages, which then flood my syslog
whenever I am transferring data across my home network:
Feb 18 10:25:11 AK3000 NetworkManager: <info> (eth0): carrier now OFF (device
state 8, deferring action for 4 seconds)
Feb 18 10:25:14 AK3000 NetworkManager: <info> (eth0): carrier now ON (device
state 8)
Feb 18 10:25:14 AK3000 kernel: [ 4850.000165] b44: eth0: Link is up at 100
Mbps, full duplex.
Feb 18 10:25:14 AK3000 kernel: [ 4850.000169] b44: eth0: Flow control is off
for TX and off for RX.
Feb 18 10:25:19 AK3000 kernel: [ 4855.184716] b44: eth0: powering down PHY
Feb 18 10:25:20 AK3000 kernel: [ 4856.000089] b44: eth0: Link is down.
Feb 18 10:25:20 AK3000 NetworkManager: <info> (eth0): carrier now OFF (device
state 8, deferring action for 4 seconds)
Feb 18 10:25:22 AK3000 NetworkManager: <info> (eth0): carrier now ON (device
state 8)
Feb 18 10:25:22 AK3000 kernel: [ 4858.000167] b44: eth0: Link is up at 100
Mbps, full duplex.
Feb 18 10:25:22 AK3000 kernel: [ 4858.000171] b44: eth0: Flow control is off
for TX and off for RX.
Feb 18 10:25:26 AK3000 kernel: [ 4861.972816] b44: eth0: powering down PHY
Feb 18 10:25:26 AK3000 kernel: [ 4862.000091] b44: eth0: Link is down.
Feb 18 10:25:26 AK3000 NetworkManager: <info> (eth0): carrier now OFF (device
state 8, deferring action for 4 seconds)
Feb 18 10:25:29 AK3000 NetworkManager: <info> (eth0): carrier now ON (device
state 8)
Feb 18 10:25:29 AK3000 kernel: [ 4865.000220] b44: eth0: Link is up at 100
Mbps, full duplex.
Feb 18 10:25:29 AK3000 kernel: [ 4865.000225] b44: eth0: Flow control is off
for TX and off for RX.
Feb 18 10:25:44 AK3000 kernel: [ 4879.766475] b44: eth0: powering down PHY
Feb 18 10:25:44 AK3000 kernel: [ 4880.000112] b44: eth0: Link is down.
Feb 18 10:25:44 AK3000 NetworkManager: <info> (eth0): carrier now OFF (device
state 8, deferring action for 4 seconds)
Feb 18 10:25:47 AK3000 NetworkManager: <info> (eth0): carrier now ON (device
state 8)
Feb 18 10:25:47 AK3000 kernel: [ 4883.000175] b44: eth0: Link is up at 100
Mbps, full duplex.
Feb 18 10:25:47 AK3000 kernel: [ 4883.000180] b44: eth0: Flow control is off
for TX and off for RX.
Feb 18 10:25:56 AK3000 kernel: [ 4891.750824] b44: eth0: powering down PHY
Feb 18 10:25:56 AK3000 kernel: [ 4892.000098] b44: eth0: Link is down.
Feb 18 10:25:56 AK3000 NetworkManager: <info> (eth0): carrier now OFF (device
state 8, deferring action for 4 seconds)
Feb 18 10:25:59 AK3000 NetworkManager: <info> (eth0): carrier now ON (device
state 8)
Feb 18 10:25:59 AK3000 kernel: [ 4895.000172] b44: eth0: Link is up at 100
Mbps, full duplex.
Feb 18 10:25:59 AK3000 kernel: [ 4895.000176] b44: eth0: Flow control is off
for TX and off for RX.
Feb 18 10:26:06 AK3000 kernel: [ 4902.009490] b44: eth0: powering down PHY
Feb 18 10:26:07 AK3000 kernel: [ 4903.000099] b44: eth0: Link is down.
My hardware according to lspci:
02:05.0 Ethernet controller: Broadcom Corporation BCM4401 100Base-T (rev 01)
Subsystem: ASUSTeK Computer Inc. Device 80a8
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 32
Interrupt: pin A routed to IRQ 20
Region 0: Memory at dc000000 (32-bit, non-prefetchable) [size=8K]
Capabilities: [40] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-
Kernel driver in use: b44
Kernel modules: b44
I'm running Lucid.
--
network manager slowing down internet connection (lucid)
https://bugs.launchpad.net/bugs/503545
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