Gbit rule (lemmy.ml)

submitted 9 months ago by roon@lemmy.ml to c/196@lemmy.blahaj.zone

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[-] AVincentInSpace@pawb.social 3 points 9 months ago

I'm invested now. Definitely report back!

[-] slice@feddit.de 2 points 9 months ago

Same

[-] SteveTech@programming.dev 1 points 9 months ago* (last edited 9 months ago)

Alright, so testing with iperf3 to a 10G host:

Single Direction - 7.06 Gbps RX (2.35, 2.35, 1.25, 1.11 Gbps individually), 9.4 Gbps TX (All 2.35 Gbps)
Bidirectionally - 8 Gbps Total, 1.538 Gbps RX & 6.55 Gbps TX (315/1220, 232/2080, 256/1520, 735/1730 Mbps individually)

4x USB NICs on the laptop, 1x Solarflare SFN5122F NIC on the desktop, there were 2 10G switches in between which may have affected the speeds slightly.

Also I can get 4.6 Gbps total (2.3/2.3) bidirectionally on one interface, so I would have expected ~16 Gbps with 4, so that's interesting I guess? My desktop can do 18.6 Gbps total (9.55/9.11) to my server so idk.

Edit: I was using 1500 MTU, I don't feel like testing again with jumbo frames.

[-] AVincentInSpace@pawb.social 2 points 9 months ago* (last edited 9 months ago)

Fascinating, especially that the RX direction saw such varied speeds across the various NICs. Guess that switch wasn't too keen on trying to split the packets evenly. Also -- 1.5Gbit RX in bidirectional mode? ...all I can say is yikes.

Very good to know.

@slice@feddit.de -- you were interested in this too

[-] SteveTech@programming.dev 2 points 9 months ago

Guess that switch wasn't too keen on trying to split the packets evenly.

Yeah probably, I was just using one of those cheap 2x 10G + 4x 2.5G switches that ServeTheHome recently did a video on, so I would not be surprised if that was the bottle neck here.

I could maybe try buying a few more SFP+ transceivers and using my more trustworthy switches, but that seems too expensive for a project like this.