[USRP-users] about 10 Gig ethernet configuration

Sanjoy Basak sanjoybasak14 at gmail.com
Mon Oct 19 15:03:49 EDT 2015


Hi Experts,
We recently bought a 10 Gig ethernet card (X510-DA2) and Twinaxial-Kabel
SFP+ M SFP+ M 3,0m. I installed it in our pc (OS: Ubuntu Mate 14.04.3 LTS)
and can communicate with X310/SBX-120 properly. However, the performance we
are getting is quite poor. I am getting dropped packets (D O) mostly at
25,50 MSps and goes quite crazy at 100 MSps and sometimes even at lower
sample rates.
Previously I tested with 1 Gig ethernet, at 25 MSps I could stream without
any drop/late packet or underrun.
The CPU uses or network uses is also not reaching 100%.

Could you please tell me what to check/correct so I can stream at 100 MSps
without any error?

I am putting the ifconfig and ethtool results and the kernel version(
3.16.0-30-generic)

eth2      Link encap:Ethernet  HWaddr 90:e2:ba:a6:a9:dd
          inet6 addr: fe80::92e2:baff:fea6:a9dd/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:9000  Metric:1
          RX packets:4530726 errors:146 dropped:0 overruns:0 frame:146
          TX packets:6811057 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:26331306938 (26.3 GB)  TX bytes:35856233935 (35.8 GB)

Settings for eth2:
Supported ports: [ FIBRE ]
Supported link modes:   10000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: No
Advertised link modes:  10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10000Mb/s
Duplex: Full
Port: Other
PHYAD: 0
Transceiver: external
Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
Current message level: 0x00000007 (7)
      drv probe link
Link detected: yes

Our computer config is:
Processor: 12*Intel(R) Xeon (R) CPU E5-2620 v3 @2.40 GHz
RAM: 65871 MB
SSD raid 5


Best regards
Sanjoy
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