Full Duplex Flow Control v Non Flow Control on 10GbE SFP+

[RumorConsumer]

Hello!

I have a MacBook Pro 13" Mid 2017 3.5ghz, 16gb RAM. With it Im using a Synology 3615xs with 32gb RAM and the SFP+ card - https://www.amazon.com/Synology-Dual-Port-Ethernet-Adapter-E10G17-F2/dp/B01LJUOBL8

I am connecting to it with a Sonnet 10G Solo SFP+ - https://www.sonnetstore.com/products/solo10g-sfp-tb3
which is incredible.


The thing pulls 995mb/sec off the array which is pretty good. Sonnet's performance tuning instructions say to change the hardware link settings from Full Duplex w Flow Control to Full Duplex sans Flow Control and change the MTU to 9000 for jumbo frames. The jumbo frames require an MTU adjustment on both the Mac and the Synology. When I turn off Flow Control on the Mac and hit apply, the Mac all of a sudden reports the connection was terminated. There is no visible way to make a similar adjustment on the Synology like there is with MTU. So it looks like the NIC in the Synology is saying no way Jose to losing Flow Control. When I look in System Profiler under Networking, it reports the interface employs Flow Control. Anybody know what setting I might need to adjust for this not to happen? Don't worry about it? Any light shed would be awesome. Thanks.

 

[guzhogi]

Haven't used Synology before, but which order are you switching off flow control (ie your MacBook first or the Synology first)? I would think that you'd need to do the Synology settings first since you wouldn't be able to connect to it otherwise.

 

[RumorConsumer]

Haven't used Synology before, but which order are you switching off flow control (ie your MacBook first or the Synology first)? I would think that you'd need to do the Synology settings first since you wouldn't be able to connect to it otherwise.

kind of the issue tho there isn't a synology setting for flow control. Im getting 995mb/sec tho so not complaining.