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Sender: Larry Finger <larry.finger@gmail.com>
Message-ID: <a93c3af3-2102-93f2-79f8-6fc83ca2d5cc@lwfinger.net>
Date:   Tue, 2 Aug 2022 13:44:25 -0500
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Subject: Re: Terrible performance form Lenovo Ideapad using RTL8852AE 802.11ax
 on 5.17 kernel (ubuntu)
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To:     Andrew than <linux_kernel_aathan@memeplex.com>,
        linux-wireless@vger.kernel.org
References: <0cdbbf6f-5003-946b-7910-dbfbb83ee31b@memeplex.com>
From:   Larry Finger <Larry.Finger@lwfinger.net>
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On 8/2/22 12:53, Andrew than wrote:
> Hello all:
> 
> Please direct me on what additional information I can provide.
> 
> I recently added a Lenovo Ideapad to my wifi network. Two mac hosts on that 
> network experience no issue whatsoever with the network (desktop + macpro laptop).
> 
> A simple scp test between the desktop & macpro vs desktop & lenovo yields a 50% 
> difference in throughput.
> 
> Interactive performance of ssh is horrible vs the lenovo. I looked but didn't 
> find any TCP_NODELAY / Nagel's related settings for sshd. However, the scp 
> performance leads me to believe that's not the issue.
> 
> I've seen other reports of slow performance of these cards/drivers (e.g. 
> https://github.com/lwfinger/rtw89/issues/36)
> 
> Any ideas?
> 
> 
> 
>    *-network
>         description: Wireless interface
>         product: RTL8852AE 802.11ax PCIe Wireless Network Adapter
>         vendor: Realtek Semiconductor Co., Ltd.
>         physical id: 0
>         bus info: pci@0000:03:00.0
>         logical name: wlo1
>         version: 00
>         serial: 14:5a:fc:01:c2:xx
>         width: 64 bits
>         clock: 33MHz
>         capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
> wireless
>         configuration: broadcast=yes driver=rtw89_pci 
> driverversion=5.17.0-1014-oem firmware=N/A ip=192.168.x.x latency=0 link=yes 
> multicast=yes wireless=IEEE 802.11
>         resources: irq:64 ioport:2000(size=256) memory:d1600000-d16fffff
> 

I reported this at the GitHub repo, but I will put it here for others to see.

I tried your scp test with a 204 MB file. Using the 5G band on a wifi5 router 
(AC1900), I got 49.2 MBps (399 Mbps) for uploads and 64.0 MBps (511 Mbps) for 
downloads. The other end was a desktop connected to the network via a wire. 
Using my local speedtest, I got 587 Mbps down and 481 Mbps up. With file reads 
and writes, scp should be a little slower than speedtest. My signal reported by 
'iw dev ... scan' is -45 dBm.

You did not tell me what your kernel is, but from the name (rtw89_pci), I see 
that you are using the in-kernel version. The one from this repo, which I am 
using, would be rtw89pci with no underscore.

Larry