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 for ath10k@lists.infradead.org; Mon, 20 May 2019 19:54:19 +0000
Subject: Re: Problem with 9984 in routed mode with 512b frames.
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From: Ben Greear <greearb@candelatech.com>
Message-ID: <41a3c98c-4cea-3d85-cc70-d153d18dc672@candelatech.com>
Date: Mon, 20 May 2019 12:54:16 -0700
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To: Adrian Chadd <adrian@freebsd.org>, Sebastian Gottschall <s.gottschall@newmedia-net.de>
Cc: ath10k <ath10k@lists.infradead.org>

On 5/20/19 12:25 PM, Adrian Chadd wrote:
> On Mon, 20 May 2019 at 09:59, Sebastian Gottschall
> <s.gottschall@newmedia-net.de> wrote:
> 
> 
>> the curious thing is still that the fallback code applies only for 2.4
>> ghz so it would never have affected 802.11ac
> 
> Hm, does RC fall back to 11na or 11a rates when doing 11ac? (in 5G
> mode.) It's good to know fixing that would fix it in 2.4GHz operation
> but yeah, I wonder about RC in 5G.

It appears the rate-ctrl tries to fall to CCK 2Mbps or 1Mbps and skips a/g rates.  /n
rates are a subset of VHT, so those are used as part of normal VHT rate-ctrl.

I have no explanation for why I saw the tx-hang in stock-ish firmware, which indeed
should not have tried to use any a/g rates in 5Ghz.  The high-level failure looked exactly like
what I eventually debugged as falling back to /a rates in my firmware, for what that
is worth.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com


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