linux-kernel - Re: [PATCH RESEND net-next v6 0/3] Add DWMAC glue driver for Motorcomm YT6801

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Message-ID: <147b700c-cae2-4286-b532-ec408e00b004@tuxedocomputers.com>
Date: Mon, 19 Jan 2026 16:33:17 +0100
From: Georg Gottleuber <ggo@...edocomputers.com>
To: Yao Zi <me@...ao.cc>
Cc: andrew+netdev@...n.ch, davem@...emloft.net, edumazet@...gle.com,
 kuba@...nel.org, pabeni@...hat.com, Frank.Sae@...or-comm.com,
 hkallweit1@...il.com, linux@...linux.org.uk, rmk+kernel@...linux.org.uk,
 vladimir.oltean@....com, wens@...e.org, jszhang@...nel.org,
 0x1207@...il.com, linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 jeffbai@...c.io, kexybiscuit@...c.io
Subject: Re: [PATCH RESEND net-next v6 0/3] Add DWMAC glue driver for
 Motorcomm YT6801

Hi,

I tested this driver with our TUXEDO InfinityBook Pro AMD Gen9. Iperf
revealed that tx is only 100Mbit/s:

## YT6801 TX

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  8.75 MBytes  73.3 Mbits/sec    0    164 KBytes

[  5]   1.00-2.00   sec  8.62 MBytes  72.4 Mbits/sec    0    164 KBytes

[  5]   2.00-3.00   sec  8.62 MBytes  72.4 Mbits/sec    0    164 KBytes

[  5]   3.00-4.00   sec  8.12 MBytes  68.2 Mbits/sec    0    164 KBytes

[  5]   4.00-5.00   sec  8.62 MBytes  72.3 Mbits/sec    0    164 KBytes

[  5]   5.00-6.00   sec  8.50 MBytes  71.3 Mbits/sec    0    164 KBytes

[  5]   6.00-7.00   sec  8.25 MBytes  69.2 Mbits/sec    0    164 KBytes

[  5]   7.00-8.00   sec  8.62 MBytes  72.4 Mbits/sec    0    164 KBytes

[  5]   8.00-9.00   sec  8.50 MBytes  71.3 Mbits/sec    0    164 KBytes

[  5]   9.00-10.00  sec  8.62 MBytes  72.3 Mbits/sec    0    164 KBytes

- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  85.2 MBytes  71.5 Mbits/sec    0             sender
[  5]   0.00-10.05  sec  84.4 MBytes  70.5 Mbits/sec
receiver


## YT6801 RX

[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   112 MBytes   939 Mbits/sec
[  5]   1.00-2.00   sec   112 MBytes   941 Mbits/sec
[  5]   2.00-3.00   sec   112 MBytes   941 Mbits/sec
[  5]   3.00-4.00   sec   112 MBytes   942 Mbits/sec
[  5]   4.00-5.00   sec   112 MBytes   942 Mbits/sec
[  5]   5.00-6.00   sec   112 MBytes   943 Mbits/sec
[  5]   6.00-7.00   sec   112 MBytes   941 Mbits/sec
[  5]   7.00-8.00   sec   112 MBytes   942 Mbits/sec
[  5]   8.00-9.00   sec   112 MBytes   942 Mbits/sec
[  5]   9.00-10.00  sec   112 MBytes   941 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.04  sec  1.10 GBytes   941 Mbits/sec   88             sender
[  5]   0.00-10.00  sec  1.10 GBytes   941 Mbits/sec
receiver

With our normally used DKMS module, Ethernet works with full-duplex and
gigabit. Attached are some logs from lspci and dmesg. Do you have any
idea how I can debug this further?

Regards,
Georg


View attachment "dmesg_lspci_motorcomm_ibp14gen9_AMD.txt" of type "text/plain" (6246 bytes)