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Message-ID: <ab664a0f23ca833fc531fcad61125da39328c888.camel@ocrete.ca>
Subject: rtl8812ae: high ping under load (or randomly)
From:   Olivier =?ISO-8859-1?Q?Cr=EAte?= <olivier.crete@ocrete.ca>
To:     linux-wireless@vger.kernel.org
Cc:     pkshih@realtek.com
Date:   Mon, 06 Jul 2020 18:24:42 -0400
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Hi,

I have a rtl 8812ae PCI desktop card and I get really poor connectivity
in Linux. In particular, I get ping times that increase a lot if I use
the connection a lot.

What I noticed by comparing with my Intel-based laptop next to it is
that iwconfig always reports a rate of 866.7Mb/s, while the rate on my
laptop fluctuates in the 100-250Mb/s range. I tried forcing the rate
with iwconfig, and it seems to help a little, but it's still not good
enough. So I suspect something is wrong with the rate control?

I've played around with the various rtlwifi module options and they
don't help.

I was suggested disable ASPM, but my motherboard doesn't seem to
support ASPM at all.

On the same computer, the card works as advertised in Windows, so I'm
pretty sure it's a driver/software issue.

I'm testing with kernel 5.6.19 and linux-firmware 20200619. And the
card is a TP-Link Archer T4E.

Please let me know how I can help debug this,

-- 
Olivier Crête
olivier.crete@ocrete.ca