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Date:   Sat, 18 Mar 2023 05:40:19 +0000
To:     Klaus Kudielka <>
Subject: Re: [PATCH net-next v4 0/4] net: dsa: mv88e6xxx: accelerate C45 scan


This series was applied to netdev/net-next.git (main)
by Jakub Kicinski <>:

On Wed, 15 Mar 2023 17:38:42 +0100 you wrote:
> Starting with commit 1a136ca2e089 ("net: mdio: scan bus based on bus
> capabilities for C22 and C45"), mdiobus_scan_bus_c45() is being called on
> buses with MDIOBUS_NO_CAP. On a Turris Omnia (Armada 385, 88E6176 switch),
> this causes a significant increase of boot time, from 1.6 seconds, to 6.3
> seconds. The boot time stated here is until start of /init.
> Further testing revealed that the C45 scan is indeed expensive (around
> 2.7 seconds, due to a huge number of bus transactions), and called twice.
> [...]

Here is the summary with links:
  - [net-next,v4,1/4] net: dsa: mv88e6xxx: don't dispose of Global2 IRQ mappings from mdiobus code
  - [net-next,v4,2/4] net: dsa: mv88e6xxx: re-order functions
  - [net-next,v4,3/4] net: dsa: mv88e6xxx: move call to mv88e6xxx_mdios_register()
  - [net-next,v4,4/4] net: dsa: mv88e6xxx: mask apparently non-existing phys during probing

You are awesome, thank you!
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