iperf not over 250 mbps? (PC to ROUTER ST-N66u)

[lmerega]

Hi everybody, I am moving to a FTTH with 1 Gbps line.
So I am testing my RT-N66U to see if everything is ok.
This is on my router:

iperf -s -P 1 -i 1 -p 5001 -f m

This is on my PC:

iperf -c lmerouter -P 1 -i 1 -p 5001 -f m -t 10

This is the result

[  3]  0.0- 1.0 sec  26.4 MBytes   221 Mbits/sec
[  3]  1.0- 2.0 sec  26.2 MBytes   220 Mbits/sec
[  3]  2.0- 3.0 sec  26.5 MBytes   222 Mbits/sec
[  3]  3.0- 4.0 sec  26.2 MBytes   220 Mbits/sec
[  3]  4.0- 5.0 sec  26.5 MBytes   222 Mbits/sec
[  3]  5.0- 6.0 sec  29.0 MBytes   243 Mbits/sec
[  3]  6.0- 7.0 sec  26.5 MBytes   222 Mbits/sec
[  3]  7.0- 8.0 sec  28.8 MBytes   241 Mbits/sec
[  3]  8.0- 9.0 sec  26.5 MBytes   222 Mbits/sec
[  3]  9.0-10.0 sec  26.5 MBytes   222 Mbits/sec
[  3]  0.0-10.0 sec   269 MBytes   226 Mbits/sec

I tried to restore factory settings, using a CAT6 cable, attach only my PC to the router... same result.
Now, iperf is installed on my USB stick. Can it be the problem?
What else could I verify?
My PC network card is on my Asus mainboard 1 Gbps enabled.

P.S. This is between two PCs connected to the RT-N66U

[  4]  0.0- 1.0 sec   112 MBytes   941 Mbits/sec
[  4]  1.0- 2.0 sec   113 MBytes   949 Mbits/sec
[  4]  2.0- 3.0 sec   113 MBytes   946 Mbits/sec
[  4]  3.0- 4.0 sec   113 MBytes   949 Mbits/sec
[  4]  4.0- 5.0 sec   113 MBytes   949 Mbits/sec
[  4]  5.0- 6.0 sec   113 MBytes   949 Mbits/sec
[  4]  6.0- 7.0 sec   113 MBytes   948 Mbits/sec
[  4]  7.0- 8.0 sec   113 MBytes   949 Mbits/sec
[  4]  8.0- 9.0 sec   112 MBytes   943 Mbits/sec
[  4]  9.0-10.0 sec   113 MBytes   947 Mbits/sec
[  4]  0.0-10.0 sec  1130 MBytes   946 Mbits/sec

TIA

Luca

 

[schmerg]

Hi everybody, I am moving to a FTTH with 1 Gbps line.
So I am testing my RT-N66U to see if everything is ok.

FTTH with 1Gbps ??
I am tempted not to reply, but putting petty jealousy aside ...

I had previously cross compiled iperf3 to run on my RT-N66U so I fired it up to check (did you cross compile or is this from Entware or similar)?
Like you I can get ~950Mbits between devices, but performance to the iperf3 server running on the router itself peaks around 190Mbits (I'm running with just plain "-s" and "-c 192.168.1.1" so default ports etc).
My personal WAN (FTTC) runs at about 60Mb, and the router handles that fine (drops to about 15 when I then route via a VPN but that I put down to mixture of the VPN overhead and bandwidth of the VPN server).

I would utter suspicions about the devices not being spec'ed to handle full gigabit WAN speeds, NAT and firewall overhead, but other threads here show some people getting near Gigabit WAN speeds, and other struggling to do so, so it may be worth you checking actual throughput rather than iperf on the server (put a gigabit machine on the WAN port and have it give the Asus an IP address, run iperf server on that machine and test it THRU the router) and then check threads such as

https://www.snbforums.com/threads/rt-n66u-wan-bandwidth.27781/

if you still have issues

Regards

--
Tim

 

[lmerega]

FTTH with 1Gbps ??
I am tempted not to reply, but putting petty jealousy aside ...

Don't be jealous... it's only a test for about a week.
Then they will give me a 200/20 Mbps FTTH.
Not bad, anyway

I had previously cross compiled iperf3 to run on my RT-N66U so I fired it up to check (did you cross compile or is this from Entware or

I installed it using entware.

(put a gigabit machine on the WAN port and have it give the Asus an IP address, run iperf server on that machine and test it THRU the router)

Good advice. I will test it tomorrow morning and report back.

Thx

Luca

 

[lmerega]

Ok, testing as you told me gave me these values:

------------------------------------------------------------
Client connecting to 192.168.0.1, TCP port 5001
TCP window size:  208 KByte (default)
------------------------------------------------------------
[  3] local 192.168.20.20 port 57043 connected with 192.168.0.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   937 MBytes   786 Mbits/sec

I reached alsto 800 Mbps.
I think this is the maxum this router can handle... am I wrong?
Reading several posts looks like this is its top speed in LAN/WAN configuration...
P.S. I had to enable HW acceleration and my CPU goes to 100%

Let me know if this is correct.

 

[ColinTaylor]

Yes that's correct.

http://www.smallnetbuilder.com/wire...n900-gigabit-router-reviewed?showall=&start=2