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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