Hi Rob, Marcus,
thank you for your answers.
Yes, I have packet loss with ping and also with iperf3 (considering udp)
at low rates (500Mb, 1Gb).
From the host side I can also see continuous disconnection and
re-connection of the link. For the Intel X520-DA2 NIC, I have bought
Intel SFP+ (E10GSFPSR) but this does not resolve the issue.
I would like to clarify my setup, maybe it can help to find out what is
going wrong:
* First setup:
o Dell PowerEdge R550 (2xXeon Gold) equipped with dual port
Broadcom BCM57414 NetXtreme-E 10Gb/25Gb.
o USRP Ettus N310
o 4x SFP+ FS transceiver at 850nm (SR)
o 2x LC/UPC-LC/UPC Duplex, Single mode Fiber patch cables
* Second setup:
o Dell Precision tower 3650 (Intel core i9) equipped with dual
port Intel X520-DA2 10Gb
o USRP Ettus N310
o 2x SFP+ FS transceiver at 850nm (SR)
o 2x Intel E10GSFPSR
o 2x LC/UPC-LC/UPC Duplex, Single mode Fiber patch cables
For the USRP, I considered UHD 4.2.0, 4.0.0 and 3.15.0. All of them
highlight an unstable connection (packet loss and flapping)
Do you have other hints?
Thank you
Federico
On 27/07/22 17:45, Marcus D. Leech wrote:
On 2022-07-27 11:30, Rob Kossler wrote:
Hi Federico,
I have several N310s and different types of 10Gb links: direct attach
copper, multi-mode (850nm), single mode (1310nm). All have worked
well including the transceivers from lower cost vendors such as FS
and GTek. I have also used the X520-DA2. So, while it is possible
that your transceivers are causing the problem, I want to point out
that there are other causes for sequence errors related to the
optimization of networking on the host. Do your sequence errors
happen at all transfer rates or only at very high rates?
Rob
It was noted that he had errors even with "ping", so I don't think
it's a host-performance issue.
I have recently deployed a 10Ge connection on an *X310*, using an
82599-based card with SFP+, transceivers from 10GTek intended for
850nm multi-mode fiber with
duplex LC terminations, and matching OM3 LC-terminated duplex cable,
also from 10GTek. That worked flawlessly. Not exactly the same
situation (N310 vs X310), but
an indicator that this can work just fine.
The fiber ends can get dirty if you run the cabling without the caps
on--wipe with an alcohol wipe and let dry.
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