Re: [PATCH net-next v4 2/2] net: dsa: realtek: rtl8365mb: add HSGMII support for RTL8367S

[Johan Alvarado]

On 7/9/2026 5:02 PM, Mieczyslaw Nalewaj wrote:
> Performance degradation without setting these registers can only be
> observed in HSGMII mode with simultaneous load on multiple LAN ports.
>
> This was noticed during work on adding support for the Mercusys MR85X
> router with DSA to OpenWrt: https://github.com/openwrt/openwrt/pull/19445#issuecomment-4505613294

Thanks, that is exactly the measurement I was hoping for. The ~1020
Mbit/s combined ceiling reported there with multiple clients sits
right where the 0x1FFFF reset default (~1.048 Gbps of wire rate)
would put it, and the jump to ~2 Gbit/s once the limiters are raised
settles the open question: the reset default is a real cap, and the
"disable" wording in the vendor comment does not match the silicon.
It also confirms why neither of us could see it with a single client:
one 1G port never reaches the limit.

I have updated v5 accordingly: the code comment and commit message
now state the cap as observed instead of hedging between the two
readings, and patch 2 carries a Link to that GitHub comment as the
reference for the measurement. I will send the series shortly.

Best regards,
Johan