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

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