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Surprisingly slow throughput on GigE ports of GS110EMX
I have a pair of NETGEAR GS110EMX switches, one connected via port 10 to the 2.5Gbps port of an Orbi RBRE960 router, and the second connected "back to back" to the first switch through their 10Gbps p...
Flow control! It was always FLOW CONTROL.
After GPTing around looking for a solution, I decided to try enabling port-based flow control on the upstream (10Gbps) port, thinking perhaps, as I mentioned above, that I was experiencing buffer overflows downstream to the GigE port. Sure enough, with Flow Control enabled on the higher speed interface, I'm now getting 960Mbps on the lower speed GigE port.
I really, really wish I'd have tried that before ripping the house apart, and purchasing another 8-port 10GigE switch. Ah well. Lesson learned. Hopefully this will help someone else out in the future.
<RANT>
Coming from a commercial networking world, I'm surprised and a bit disappointed that the NETGEAR switch just doesn't "work" out of the box. Perhaps with a 10:1 port speed mismatch, flow control is the only solution.
</RANT>
– Dave
ViperGeek wrote:
Has anyone run into this strange situation with the GS110EMX managed switch?
Hello Dave,
Have run in the past a lot of Beta testing, before the GS110EMX (and the GS810EMX aka. the Nighthawk SX10 Pro Gaming 10-Gigabit/Multi-Gigabit Switch) appeared in the wild Internet., never spotted such a massive performance impact. Still operating a GS110EMX here at home on a 10 GbE Uplink.
Let me allow one comment: This is in no aspect a managed switch, much more a switch built around an unmanaged switch core, extended with some uC to drive the NSDP (for both discovery and if enabled the L2 configuration protocol implemented in the ProSafe Plus Configuration Utility, and Web UI.
Regards,
-Kurt.
schumaku wrote:
Have run in the past a lot of Beta testing, before the GS110EMX (and the GS810EMX aka. the Nighthawk SX10 Pro Gaming 10-Gigabit/Multi-Gigabit Switch) appeared in the wild Internet., never spotted such a massive performance impact. Still operating a GS110EMX here at home on a 10 GbE Uplink.Thanks for the reply and confirmation about the abilities of the GS110EMX. It's a bit perplexing to me, because:
- it's happening to both switches
- 10GbE (negotiated 2.5Gbps) → 10GbE (negotiated 2.5Gbps) works fantastically fast; almost to PHY limits
It's almost as if, by forwarding a 2.5Gbps stream to a GigE port, I'm overflowing some flow control or packet buffers, causing retransmissions and a low effective RX speed.
Other suggestions, comments, or opinions welcome.
– Dave
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