On 21/01/2021 03:24 pm, The Natural Philosopher wrote:

For reasons not pertinent to PIs, I started researching wifi
performance, and would like the assembled multitudes to comment on the correctness, or otherwise of what I have found.

- All Pis with built-in Wifi use the Broadcomm chip
- This chip is not capable of 5Ghz connectivity
- Nor is it capable of 40Mhz dual channel operation
- ergo it *cannot* connect at *more* than 72Mbps

And its often _way_ worse than that.

Both my Pi3B+ connect to my 5Ghz wifi.

--
Chris Elvidge
England

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

For reasons not pertinent to PIs, I started researching wifi
performance, and would like the assembled multitudes to comment on the correctness, or otherwise of what I have found.

- All Pis with built-in Wifi use the Broadcomm chip
- This chip is not capable of 5Ghz connectivity
- Nor is it capable of 40Mhz dual channel operation
- ergo it *cannot* connect at *more* than 72Mbps

And its often _way_ worse than that.


--
“The fundamental cause of the trouble in the modern world today is that
the stupid are cocksure while the intelligent are full of doubt."

- Bertrand Russell

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 21/01/2021 15:39, Chris Elvidge wrote:

On 21/01/2021 03:24 pm, The Natural Philosopher wrote:

For reasons not pertinent to PIs, I started researching wifi
performance, and would like the assembled multitudes to comment on the
correctness, or otherwise of what I have found.

- All Pis with built-in Wifi use the Broadcomm chip
- This chip is not capable of 5Ghz connectivity
- Nor is it capable of 40Mhz dual channel operation
- ergo it *cannot* connect at *more* than 72Mbps

And its often _way_ worse than that.

Both my Pi3B+ connect to my 5Ghz wifi.

+++!

can you show what chipsets/drivers and what protocols they are using?

It would be nice to tabulate the results


--
“A leader is best When people barely know he exists. Of a good leader,
who talks little,When his work is done, his aim fulfilled,They will say,
“We did this ourselves.”

― Lao Tzu, Tao Te Ching

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 21/01/2021 03:45 pm, The Natural Philosopher wrote:

On 21/01/2021 15:39, Chris Elvidge wrote:

On 21/01/2021 03:24 pm, The Natural Philosopher wrote:

For reasons not pertinent to PIs, I started researching wifi
performance, and would like the assembled multitudes to comment on
the correctness, or otherwise of what I have found.

- All Pis with built-in Wifi use the Broadcomm chip
- This chip is not capable of 5Ghz connectivity
- Nor is it capable of 40Mhz dual channel operation
- ergo it *cannot* connect at *more* than 72Mbps

And its often _way_ worse than that.

Both my Pi3B+ connect to my 5Ghz wifi.

+++!

can you show what chipsets/drivers and what protocols they are using?

It would be nice to tabulate the results

lshw shows:
*-network
description: Wireless interface
physical id: 2
logical name: wlan0
serial: b8:27:eb:fb:cc:a1
capabilities: ethernet physical wireless
configuration: broadcast=yes driver=brcmfmac driverversion=7.45.206 firmware=01-88ee44ea ip=192.168.23.152 multicast=yes wireless=IEEE 802.11

iwconfig:
wlan0 IEEE 802.11 ESSID:"CHRISPLACE-A"
Mode:Managed Frequency:5.3 GHz Access Point: 80:3F:5D:FA:4D:FA
Bit Rate=78 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=70/70 Signal level=-31 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

# cat /sys/class/net/wlan0/device/vendor
0x02d0
# cat /sys/class/net/wlan0/device/device
0xa9a6

02d0 is Broadcom



--
Chris Elvidge
England

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On 21/01/2021 15:24, The Natural Philosopher wrote:

For reasons not pertinent to PIs, I started researching wifi
performance, and would like the assembled multitudes to comment on the correctness, or otherwise of what I have found.

- All Pis with built-in Wifi use the Broadcomm chip
- This chip is not capable of 5Ghz connectivity
- Nor is it capable of 40Mhz dual channel operation
- ergo it *cannot* connect at *more* than 72Mbps

The Pi 3B+ and 4B have 5 GHz WiFi. I think the chips support 40MHz on
2.4GHz, but the driver doesn't.

All my 3B+s and 4Bs have Ethernet, so I can't check on the 5GHz
performance, but the 3Bs and Zeros scattered around the house do about 20-30Mbps up and down, as do the 2Bs with USB WiFi adaptors.

Just failed over a 4B on to 5GHz WiFi, its fairly close to the router
but only gives 88.6Mbs down, and 75.3 Mbs up.

So I recommend if you need speed, use Ethernet. Up to the 3B you should
get 96/92Mbps, the 3B+ does 327/270Mbs, and the 937/832MBps down/up.

---druck

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

On Thu, 21 Jan 2021 15:24:55 +0000, The Natural Philosopher wrote:

For reasons not pertinent to PIs, I started researching wifi
performance, and would like the assembled multitudes to comment on the correctness, or otherwise of what I have found.

- All Pis with built-in Wifi use the Broadcomm chip - This chip is not capable of 5Ghz connectivity - Nor is it capable of 40Mhz dual channel operation - ergo it *cannot* connect at *more* than 72Mbps

And its often _way_ worse than that.

3b+ 4b & pi400 all speak 5ghz

not sure about max speed



--

I thing you're missing the capability of Makefiles.

It takes several _hours_ to do `make' a second time on my
machine with the latest glibc sources (and no files are recompiled a
second time). I think I'll remove `build' after changing one file if
I want to recompile it.
-- Juan Cespedes <cespedes@debian.org>

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On 21/01/2021 17:42, A. Dumas wrote:

The Natural Philosopher <tnp@invalid.invalid> wrote:

- This chip is not capable of 5Ghz connectivity

The 3B+ and 4 have 5 GHz capable wifi, apparently using the Cypress
CYW43455 says https://www.hackster.io/news/meet-the-new-raspberry-pi-4-model-b-9b4698c284 although when you follow the link to Cypress it says the chip can only do Bluetooth 4.1 but RPi says it supports 5.0. So, something not right. Would
be strange to have a non-broadcom wifi chip on broadcom's baby.

It is indeed a Cyprus chip and yes it does support BT 5.0 as per
datasheet linked here..

https://www.cypress.com/file/358916/download

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

The Natural Philosopher <tnp@invalid.invalid> wrote:

- This chip is not capable of 5Ghz connectivity

The 3B+ and 4 have 5 GHz capable wifi, apparently using the Cypress
CYW43455 says https://www.hackster.io/news/meet-the-new-raspberry-pi-4-model-b-9b4698c284 although when you follow the link to Cypress it says the chip can only do Bluetooth 4.1 but RPi says it supports 5.0. So, something not right. Would
be strange to have a non-broadcom wifi chip on broadcom's baby.

--- SoupGate-Win32 v1.05
* Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3)

Chris Elvidge <chris@mshome.net> wrote:

# cat /sys/class/net/wlan0/device/vendor
0x02d0
# cat /sys/class/net/wlan0/device/device
0xa9a6

02d0 is Broadcom

Cypress bought the Wi-Fi assets from Broadcom, hence it's now a Cypress part that was designed by Broadcom, using Broadcom's vendor ID.

Theo

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