Re: rge(4) RTL8125 2.5GbE testing: 2500baseT media type not available on 16.0-CURRENT
Olivier Cochard-Labbé <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.net |
|---|---|
| Message-ID | <CA+q+Tcqsbrt-uBABWC2Q15bX9Op0SXo0yY3tN2N9MXGhcLoAzQ@mail.gmail.com> |
On Fri, Mar 6, 2026 at 5:00 PM Adrian Chadd <[email protected]> wrote: > On Thu, 5 Mar 2026 at 14:02, Olivier Cochard-Labbé <[email protected]> > wrote: > > > It shows a negotiated speed of 2.5G: > > > [snip] > > > However, I am experiencing the same 100Mb/s (yes 100) limitation that > occurred on both Ubuntu (with both the default r8169 and official Realtek > r8125 driver) and Windows: > > Despite the reported link speed, the actual throughput is capped 100Mb/s: > > > > olivier@fbsd:~$ iperf3 -c 192.168.100.1 > > (...) > > - - - - - - - - - - - - - - - - - - - - - - - - - > > [ ID] Interval Transfer Bitrate Retr > > [ 5] 0.00-10.06 sec 113 MBytes 94.3 Mbits/sec 0 > sender > > [ 5] 0.00-10.08 sec 113 MBytes 94.1 Mbits/sec > receiver > > Is it 100mbit when you neg at 1gbit? or only at 2.5g? > > Oops! While replacing the 2.5Gb switch with a 1G switch for your test, I noticed a non-compliant Ethernet cable in the uplink (between the switches). After fixing this, the 2.5Gb performance is now as expected: olivier@freebsd:~ $ iperf3 -c 192.168.100.1 Connecting to host 192.168.100.1, port 5201 [ 5] local 192.168.100.161 port 35882 connected to 192.168.100.1 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.06 sec 300 MBytes 2.37 Gbits/sec 0 1.60 MBytes [ 5] 1.06-2.06 sec 280 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 2.06-3.00 sec 264 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 3.00-4.00 sec 281 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 4.00-5.00 sec 280 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 5.00-6.06 sec 298 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 6.06-7.04 sec 275 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 7.04-8.00 sec 268 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 8.00-9.00 sec 281 MBytes 2.35 Gbits/sec 0 1.60 MBytes [ 5] 9.00-10.00 sec 281 MBytes 2.35 Gbits/sec 0 1.60 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 2.74 GBytes 2.36 Gbits/sec 0 sender [ 5] 0.00-10.01 sec 2.74 GBytes 2.35 Gbits/sec receiver iperf Done. Apologies for this oversight. Regards, Olivier