Vincent Lefevre wrote: > Stan Hoeppner wrote: > > Vincent Lefevre wrote: > > > On my laptop, Ethernet has been limited to 100 Mbps for a few days. > > > Nothing changed on the network side. Just a few upgrades on the laptop > > > (Debian/unstable). Any explanation? > > > > Gigabit ethernet is fully auto negotiating at the hardware level--a > > software update shouldn't cause negotiation to drop to 100. GBE uses > > all 8 conductors of category 5e/6 cabling, fast ethernet uses only 4. > > If it's negotiating to 100, I'd say you have a bad cable, connector > > (cable or receiver port), or switch port. > > The Ethernet cable was the same as before, and I've tried a second > one, and it's still 100. I've also tried another port on the switch. I think it would be useful to double check the settings using ethtool to dump the current values. Maybe there will be a clue in your output. Here is an example from my machine. # 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 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 2 Transceiver: internal Auto-negotiation: on MDI-X: on (auto) Supports Wake-on: pumbg Wake-on: g Current message level: 0x00000007 (7) drv probe link Link detected: yes I have been using 'iperf' lately for bandwidth testing. Just getting a GigE connection does not mean that I get full wire speeds out of it end to end. So it is good to have an objective tool to test. $ iperf -s ... [ 3] 0.0-10.0 sec 904 MBytes 758 Mbits/sec Bob
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