[PLUG] Baffled: CentOS 7 DHCP 10G fast, fixed 1G
Michael Dexter
dexter at pdxlinux.org
Thu Nov 14 11:51:52 UTC 2019
On 11/13/19 1:07 PM, alan at clueserver.org wrote:
> What does ethtool tell you?
"DHCP" via network-scripts:
Settings for p2p1:
Supported ports: [ TP ]
Supported link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Advertised link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 10000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: external
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
iperf3 sample:
[ 4] 0.00-1.00 sec 114 MBytes 955 Mbits/sec 0 375 KBytes
[ 4] 1.00-2.00 sec 113 MBytes 946 Mbits/sec 0 375 KBytes
$ sudo dhclient p2p1
[cecheverri at rbx-1 ~]$ sudo ethtool p2p1
Settings for p2p1:
Supported ports: [ TP ]
Supported link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Advertised link modes: 100baseT/Full
1000baseT/Full
10000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 10000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: external
Auto-negotiation: on
MDI-X: Unknown
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes
iperf3 sample:
[ 4] 0.00-1.00 sec 1.10 GBytes 9.41 Gbits/sec 0 1.23 MBytes
[ 4] 1.00-2.00 sec 1.10 GBytes 9.42 Gbits/sec 3 1.14 MBytes
[ 4] 2.00-3.00 sec 1.09 GBytes 9.40 Gbits/sec 3 1.14 MBytes
So, identical ethtool output unless I'm missing something?
Maybe responsible: There are two NICs on the same subnet as not to get
locked out. Some OSs tolerate this while some do not. Because "dhclient"
addressing works fine, I trust that is okay but the plan is to next try
it without the 1GbE interface connected.
Other ideas?
In short, 'dhclient <interface>' gives a solid 10GbE. DHCP via
network-scripts drops to 1GbE.
Michael
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