On 12/02/18 21:51, Ed Greshko wrote:
On 02/13/18 05:43, Stephen Morris wrote:
I am using a home plug device to get ethernet access across the home electrical
wires. The home plug device is provide 500 Mb/s, so having seen this thread I've
checked my ethernet configuration and like Terry is saying my settings have auto
negotiate unchecked and the link speed is set at 100 Mb/s and Half Duplex. I 
not explicitly set that configuration but what I don't know, because I haven't
really taken any notice of it as I only use this connection as a backup to
wireless, is whether or not those settings have always been there. I have done 
changes to the configuration since I set it up in F26.

One can always use

ethtool <devname>     to determine what is available and what the current 
settings are...

This is the view from the Fedora side....

This is what the Fedora side it telling the outside world what the HW supports

         Advertised link modes:  10baseT/Half 10baseT/Full
                                 100baseT/Half 100baseT/Full
                                 1000baseT/Half 1000baseT/Full

This is what the device that the Fedora system is connected to is  saying what 

         Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                              100baseT/Half 100baseT/Full

FWIW, I have never seen an advertised link speed of 500 Mb/s.

Yes, I used ethtool to find out what was happening after the performance of NFS went down to 10 MBytes/s.

I think what has happened is:

1. I updated these systems (5 off) from F25. This was a clean/new install but some configuration files were copied from the previous systems.

2. The /etc/sysconfig/network-scripts/ifcfg-Wired_connection_1 file (or appropriate named one) was copied from the previous system.

3. These files did not have the new ETHTOOL_OPTS="autoneg on" entry.

4. All was working fine (Gigabit full duplex) for a month or so until someone/something updated the ifcfg file. If you use the KDE-Plasma NetworkManager settings tool and it sees no ETHTOOL_OPTS entry, it sets the GUI settings to manual 100Mbits/s half duplex rather than auto. So if you don't notice this and save the settings the Ethernet will be set to this. I will try and enter a bug report for this somewhere.

In my case I don't believe I changed the Ethernet settings using the KDE-Plasma NetworkManager settings tool, certainly not on all of the systems. I think something else may have written the ETHTOOL_OPTS="100mbps" entry somehow with an RPM update within the last week.

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