Disconnected due to excessive missing ACKs on Ath10k (OpenWRT Chaos Chalmer RC2)

Michal Kazior michal.kazior at tieto.com
Wed Jul 15 00:09:38 PDT 2015

On 14 July 2015 at 19:29, Fernando S <fsclavo at gmail.com> wrote:
> I'm having dropouts on my TP-Link Archer C7, 2.4Ghz Wlan runs perfect,
> but 5Ghz is unstable (my laptop and my Ipad 4 loss connection after a
> couple of minutes, specially on heavy traffic).
> Looking on router's log, I found:
> Thu Jul 9 20:51:32 2015 daemon.info hostapd: wlan0: STA
> 01:02:03:04:05:06 IEEE 802.11: disconnected due to excessive missing
> ACKs Thu Jul 9 20:52:02 2015 daemon.info hostapd: wlan0: STA
> 01:02:03:04:05:06 IEEE 802.11: deauthenticated due to inactivity

Hmm.. This means there had to be a peer kickout event generated in
firmware and your hostapd is configured to handle low-ack events as
disassoc triggers.

Ben recently raised a problem concerning ACK problems [1]. Perhaps
that's one of the manifestations.

You could just try disabling the `disassoc_low_ack` option in hostapd.
Stations will still be disassociated when they go out of range and
don't respond to NullFunc frames pings after a few minutes of idling
(from AP point of view).

[1]: http://lists.infradead.org/pipermail/ath10k/2015-July/005618.html

> And on client side:
> Jul 9 20:51:05 laptop wpa_supplicant[1011]: wlan0:
> CTRL-EVENT-DISCONNECTED bssid=30:30:30:30:30:30 reason=7 Jul 9
> 20:51:05 laptop NetworkManager[861]: <warn> Connection disconnected
> (reason 7)
> A little search on Google show me some old bugs, apparently resolved
> and only on ath9k (2.4Ghz): maybe the same issue is present on ath10k
> (5Ghz)?
> Please let me know if I can help to debug this issue.

Can you point to the ath9k thread/patches, please?


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