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Need help to understand my benchmark

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hey_mike

New Around Here
Hi guys!

I've made some benchmarks using iperf in my net. Now I need your help to understand what I get.

I've a Synology RT1900AC and (correct me if I'm wrong) I have 1300 mbps on 5GHz and 600 on 2.4GHz
My ethernet adapter is Gigabit, infact I have nearly 1 Gbit as shown below

mike@laptop ~ $ iperf -c 192.168.0.14 -P 1 -i 1
------------------------------------------------------------
Client connecting to 192.168.0.14, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.0.104 port 57840 connected with 192.168.0.14 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0- 1.0 sec 112 MBytes 935 Mbits/sec
[ 3] 1.0- 2.0 sec 112 MBytes 935 Mbits/sec
[ 3] 2.0- 3.0 sec 111 MBytes 933 Mbits/sec
[ 3] 3.0- 4.0 sec 111 MBytes 933 Mbits/sec
[ 3] 4.0- 5.0 sec 111 MBytes 932 Mbits/sec
[ 3] 5.0- 6.0 sec 112 MBytes 935 Mbits/sec
[ 3] 6.0- 7.0 sec 111 MBytes 933 Mbits/sec
[ 3] 7.0- 8.0 sec 112 MBytes 935 Mbits/sec
[ 3] 8.0- 9.0 sec 112 MBytes 937 Mbits/sec
[ 3] 9.0-10.0 sec 111 MBytes 929 Mbits/sec
[ 3] 0.0-10.0 sec 1.09 GBytes 934 Mbits/sec

The results via wireless are pretty different, and I don't understand them. I have the Intel Dual Band Wireless-AC 7260 that is capable of a top speed of 867 mbps, but I can only reach 350 / 400 mbps. I was expected to reach a result close to 800 mbps. The router is near my PC, it's like 10-20 cm away, AC only, 80 MHz of channel, AES and the antenna transmit at full power.

My questions:

1300 is a total value (433 mbps x3) or a peak value?
Is there something I can do to increase this speed close to 800 mbps?
thank you!
 
the WiFi connection speed (a.k.a. the burst rate) has to be multiplied by about 0.6 to an estimate of the IP layer bit rate.
Also, the MIMO rates are not additive.

Want super speed? Don't use wireless.
 
Thank You but, this is not only about super speed. I want to understand if the value I've recorder is good or bad.
To reach 1300 mbps I need a 3x3 adapter, but I only have a 2 antennas adapter (867 mbps). If this is correct, why I only reach half of this "speed"?
 
re-run your test using UDP vs. TCP - TCP needs acks, and WiFi is half-duplex...

Your numbers are actually pretty decent for a 2 stream AC connection...
 
wifi is half duplex but you can actually get 90% of bandwidth utilisation in one way and that is only with bandwidth testers that are CPU intensive and dont really care about a lot of hardware related features. for normal usage you can expect around 30-50% of the bandwidth utilisation. But when you get bandwidth utilisation to 90% you start seeing dropped packets. Another thing you need to do is to perform the test on a free channel with no interference. professional wifi tests are done in metal cages.
 
wifi is half duplex but you can actually get 90% of bandwidth utilisation in one way and that is only with bandwidth testers that are CPU intensive and dont really care about a lot of hardware related features. for normal usage you can expect around 30-50% of the bandwidth utilisation. But when you get bandwidth utilisation to 90% you start seeing dropped packets. Another thing you need to do is to perform the test on a free channel with no interference. professional wifi tests are done in metal cages.

Yeah, but AC has 35 percent embedded overhead due to management/control frames... 11n in greenfield can hit 80 percent, but only on a perfect network...

His numbers are good for TCP on 11ac...
 
And the coding rate (forward error correction, essentially) varies by signal to noise and recent correctable error rates, etc. More coding, less throughput. Coding can be over 50%.
 

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