Re: ath12k driver on Debian 12 - High ping latency and MLO support query on 6.11rc7

[Kalle Valo <kvalo@kernel.org>]

Benoit Masson <benoitm@perenite.com> writes:

> Hello ath12k developers,
>
> I'm testing the ath12k driver on Debian 12 with a custom 6.11rc7
> kernel for an M2 QCNCM865 card.

You didn't provide any dmesg out but I assume this has a WCN7850
chipset. Please provide output from 'dmesg | grep ath12k' so that we
know what firmware etc you are using.

> While generally stable, I'm encountering two issues:
>
> 1. High ping latency/jitter:
> - ath12k: 3.5ms to 55ms (40ms jitter)

Is this from network to ath12k or from ath12k to network? I recommend
testing both.

Usually Power Save Mode causes latency, have you tried disabling that?

> 2. MLO support:
> - When connected via MLO, performance mirrors 6GHz-only connection
> - Doesn't appear to utilize all three bands
>
> Questions:
> 1. Are there any recent patches addressing the latency issue for
> kernel 6.11rc7?

At least I can't think of any fix right now.

> 2. Is MLO fully supported by Linux/Qualcomm for this hardware? I'm
> willing to test any proposed solutions or gather additional data if
> needed.

MLO is not yet supported. Once there is something to test we will
announce it in this ath12k list.

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