From: Felix Fietkau <nbd@openwrt.org>
To: Harshal Chhaya <harshal@gmail.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>
Subject: Re: AR9342: Two odd packets in every beacon interval in 5Ghz
Date: Fri, 05 Apr 2013 18:15:11 +0200 [thread overview]
Message-ID: <515EF88F.1030606@openwrt.org> (raw)
In-Reply-To: <CAJ8GFOjheLNiawD7K-VnGa5ishbnr6rm0YHUvJs8XgZK1EaJtQ@mail.gmail.com>
On 2013-04-05 5:24 PM, Harshal Chhaya wrote:
> Hello,
>
> We have an AR9342-based AP that is sending out two odd packets each
> beacon interval. These packets are 1804 bytes in size, are transmitted
> at 6.5Mbps and have the dest MAC address the same as the source MAC
> address.
>
> The payload of these packets is all zeros.
>
> It does this only in 5Ghz. These packets aren't transmitted in the 2.4Ghz band.
>
> If we set the bandwidth to 40MHz, it sends only one of these packets
> between beacons.
>
> Are these some control or mgmt packets that are part of the protocol?
> Or is this unexpected behavior?
>
> The AP is running the 3.3.8 kernel and a compat-wireless from Sep 2012
> (part of the openwrt image for this chip).
Maybe it's (failing) PA predistortion calibration, which needs to send
training frames to complete.
I'd suggest trying a newer compat-wireless version, this type of
calibration has been disabled there because of various issues (including
hardware damage on some chips).
- Felix
next prev parent reply other threads:[~2013-04-05 16:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-05 15:24 AR9342: Two odd packets in every beacon interval in 5Ghz Harshal Chhaya
2013-04-05 16:15 ` Felix Fietkau [this message]
2013-04-05 16:32 ` Harshal Chhaya
2013-04-17 18:03 ` Harshal Chhaya
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