Hi all,
I have a Linksys WRT3200ACM-UK running OpenWrt 19.07.0 and I'm having an issue where I'm not getting over 600mbps on 5GHz WiFi even though I get 1Gb over ethernet.
Can anyone assist at all?
Screenshots attached
First of all, update to the latest version of OpenWrt. And second, can your router even do 1Gbps over Wi-Fi?
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Going to update now. The router supposedly does up to 1600mbps on 5GHz
That's a very theoretical lab or PowerPoint value...
I did fear that could be the case, but I also figured there might be something wrong with my configuration, so decided to ask 
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Is this your router? https://downloads.linksys.com/downloads/datasheet/WRT3200ACM_WiFiRouter_EN.pdf
The theoretical value of 2600 Mbps assumes a 160 MHz width, using the 80 MHz width cuts this in half -- although 80 MHz may give you better compatibility. It's also possible that not all three streams are being used for this specific device. As others have mentioned, you'll likely never reach the theoretical maximum speed outside of a very tightly controlled lab environment.
Then another half, since sale sheet probably assume simultaneous bidirectional throughput.
660 one way is petty good, IMHO.
You have 2x2 client, so you can't get more without 160MHz
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Just saw you're connected with the iPhone 15 Pro Max, which has a 2x2 antenna, so you can only connect to 2x 80 MHz streams in each direction, for a total combined theoretical (unidirectional) bandwidth of 867 Mbps. Again, that's lab conditions. So if you have any interference from neighbours, other connected devices, walls in the way, etc. that will decrease.
I don't believe the sales sheet is assuming simultaneous bidirectional throughput, these numbers are just from the raw data rate spec of 802.11ac.
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and that is a gross rate... rule of thumb is 1/2 to 2/3 of that gross rate might actually be achievable as easily measurable good-put (as seen in most on-line capacity test) for mostly unidirectional traffic...
I was just about to suggest two simultaneous tests on two different devices.
To make a two-computer test, consider the Crusader program. See Making Local Speed Tests for details.
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I spent a few days last week doing nothing but testing out all the various configuration combinations I could on two WRT3200ACM's with both OpenWrt 24.10.0 and DD-WRT and I can tell you OpenWrt does not seem to work at all with 160mhz channel widths. If you set the wifi channel to that a whole range of devices by google and other manufacturers will not see the network SSID's nor connect to it. Also only at 5Ghz only channel 36 seem to work.
160mhz channel widths is what you would need to get close to the theoretical maximum speeds advertised by Linksys and I've only got near those speeds with DD-WRT, which has its own issues.
The highest speed I managed to get from all my experimentation with DD-WRT and openWRT on WRT3200ACM's was 45mbps using 160mhz wide channels on DD-WRT.
You only need about 10 Mbit/s for most things.
The mindset that says I want Gigabit Wi-Fi because I have a Gigabit IPS link needs to change.
Wi-Fi Spectrum/bandwidth unlike Ethernet is shared with your neighbors.
The goal should be reliability NOT speed.
Use non overlapping channels with 2.4G at 20 Mhz and 5G at 40 Mhz.
I disagree. 40 MHz makes sense when there are several APs at the installation site. But it is not the case in a house or apartment where most Wi-Fi networks are from ISPs with 80 MHz channels.