I just had a closer look at the issue and there actually seem to be two things going on.
The higher speeds without network-manager can be explained by looking at this syslog snippet: Feb 18 16:00:10 AK3000 kernel: [24942.744427] b44: eth0: powering down PHY Feb 18 16:00:10 AK3000 kernel: [24943.001534] b44: eth0: Link is down. Feb 18 16:00:13 AK3000 kernel: [24946.004199] b44: eth0: Link is up at 100 Mbps, full duplex. Feb 18 16:00:13 AK3000 kernel: [24946.004205] b44: eth0: Flow control is off for TX and off for RX. Feb 18 16:00:13 AK3000 kernel: [24946.344094] b44: eth0: powering down PHY Feb 18 16:00:14 AK3000 kernel: [24947.001383] b44: eth0: Link is down. Feb 18 16:00:17 AK3000 kernel: [24950.000200] b44: eth0: Link is up at 100 Mbps, full duplex. Feb 18 16:00:17 AK3000 kernel: [24950.000205] b44: eth0: Flow control is off for TX and off for RX. Feb 18 16:00:18 AK3000 kernel: [24951.163050] b44: eth0: powering down PHY Feb 18 16:00:19 AK3000 kernel: [24952.002018] b44: eth0: Link is down. Feb 18 16:00:21 AK3000 kernel: [24954.004184] b44: eth0: Link is up at 100 Mbps, full duplex. Feb 18 16:00:21 AK3000 kernel: [24954.004190] b44: eth0: Flow control is off for TX and off for RX. Feb 18 16:02:15 AK3000 kernel: [25067.746944] b44: eth0: powering down PHY Feb 18 16:02:15 AK3000 kernel: [25068.000125] b44: eth0: Link is down. Feb 18 16:02:18 AK3000 kernel: [25071.001991] b44: eth0: Link is up at 100 Mbps, full duplex. Feb 18 16:02:18 AK3000 kernel: [25071.001997] b44: eth0: Flow control is off for TX and off for RX. For some reason the link is still powering up and down all the time. However, if compared to the earlier syslog (with network-manager installed) there is one difference: NM additionally generated the following message: (device state 8, deferring action for 4 seconds) It seems NM remains idle for 4 seconds whenever my link goes down and up again. Obviously this has a huge impact on the overall speed and responsiveness of the network. -- network manager slowing down internet connection (lucid) https://bugs.launchpad.net/bugs/503545 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
