linux-kernel - Re: [PATCH 1/2] wifi: mt76: mt7921: Disable powersaving by default

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Date:   Wed, 13 Dec 2023 18:27:57 +0100
From:   rwahler@....net
To:     kvalo@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Sultan Alsawaf <sultan@...neltoast.com>
Subject: Re: [PATCH 1/2] wifi: mt76: mt7921: Disable powersaving by default

From: Sultan Alsawaf <sultan@...neltoast.com>

Sultan Alsawaf <sultan@...neltoast.com> writes:

> 3. For insignificant/low-bandwidth traffic like ICMP to the AP, high latency is
>    expected since the amount of traffic doesn't warrant kicking the chipset out
>    of powersave. So although it's not pretty to look at, bad ping times to the
>    AP aren't representative of the full user experience.

Without the proposed patch ping times are often > 3000ms with a packet loss of ~20%. And it's not only ICMP packets because i.e. ssh to the laptop is also not working. It is unusable slow and very often the connection breaks completely.

Kalle Valo <kvalo@...nel.org> writes:

> Mario Limonciello <mario.limonciello@....com> writes:
>
> > Several users have reported awful latency when powersaving is enabled
> > with certain access point combinations.
>
> What APs are these exactly? In the past 802.11 Power Save Mode was
> challenging due to badly behaving APs. But nowadays with so many mobile
> devices in the market I would assume that APs work a lot better. It
> would be best to investigate the issues in detail and try to fix them in
> mt76, assuming the bugs are in mt76 driver or firmware.

I'm using a FritzBox 6591 Cable Router with latest Firmware for Wlan and use a Framework13 Laptop with built in MT7921 module. I can reliably reproduce the problem with high round trip times and packet loss for inbound connections.

If i can help with some tests to find the problem i'm happy to support you.