1. H/W Information
The NIC information installed on the SuperMicro 740GP-TNRT is as below.
1) Onboard : Dual LAN with Intel® X550 10GBase-T Ethernet Controller
2) PCI Slot
- 4x 10GbE RJ45, PCI-E x8, Intel XL710 (AOC-STG-i4T)
- 4x 10GbE RJ45, PCI-E x8, Intel XL710 (AOC-STG-i4T)
2. OS Information
- Ubuntu LTS 20.04 (18 version also has same issue.)
3. error issue
- When installing Ubuntu OS in this environment, the network continuously occurs Rx drop.
4. Verification method
1) Same issue reoccurred in same environment: device connection between Server and Switch (Server<->Switch) --> The drop occur in ‘Bond’ configuration with 2x 4Port 10Gb NIC, and drop occur also in eno1 which is Onboard.
: This issue occur in all Intel NIC.
: It also occur in single network port, therefore we can’t determine as a bonding configuration error.
: Carried out both MTU modification and autoneg alternation test.
- Continuous ‘Rx drop’ occur when connecting same server (supermicro 740GP-TNRT) eno1(Onboard)<-> Cisco 2960(Temporary switch for verification test)
2) The above ‘Drop’ issue doesn’t occur in verification test between existing server (DELL R740 : CGR81D3) eno1(Onboard) <-> Switch(NETGEAR XS728T)
3) The above ‘Drop’ issue doesn’t occur in verification between Existing Server(DELL R740 : CGR81D3) eno1(Onboard) <-> Switch Cisco 2960(Temporary switch for verification test)
** The ‘Rx drop’ occurs only on SuperMicro servers, when we do the verification test in all same network environments(where the only difference is in a server node)
4) ‘Rx drops’ do not occur in the same H/W environment in Redhat 7.x and CentOS 7.x except Ubuntu.
5) Reference information
Operating system: Ubuntu 20.04
ethtool -l eno1
This only occurs between the intel NIC and Ubuntu (the symptoms are the same in 18.x).
Please suggest a solution to solve this issue.
Jong-Hwa Lee (libero11@open-network.co.kr)
Link Copied
