RB750G performance

jaray · Sun Feb 13, 2011 12:32 am

I have a 50 megabit internet connection that I'm trying to find a router with enough processor to max out the 50megs without running high processing power to do it.
My cable provider gives me a SMCD3GN gateway/cable modem which works well for the connection. I can easily max out the 50 megs using it.
But I want to use a better router than the SMC so assumed a RB750G I had lying around would be far better for the task.
I reset the 750G to factory defaults and plug it in to the modem and start a multi-thread download as I always do and am surprised that I can only pull down about 29-30 megs no matter what I try. The interface on the modem and 750G are both running at gigabit port speed. I certainly didn't expect the 750G (with easily twice the processor of the SMC or my Linksys) to struggle at all.
Just to confirm, I connected the same computer back to the SMC gateway and restart the same download and again I pull down the full 50megabits...back to the 750G and back to 29-30 again. I had the same problem using my Linksys WRT as well, it just can't process the packets quick enough to utilize the bandwidth.
Can anyone think of any reason why the 750G should have had any problem with this? A 680Mhz processor should be more than enough...

thanks for any help or ideas...

jaray · Sun Feb 13, 2011 12:39 am

I will add that if required, I will try a RB433UAH I have around but its practically the same processor but more RAM. I keep reading how nice the 450 is so I can only assume the 750 should be even better.

THG · Sun Feb 13, 2011 1:55 am

I tested my RB750G, and here is the results from my 100 Mbps line (bandwidth test was measured ten times in a row).

Minimum: 94.4 Mbit/s
Medium: 94.8 Mbit/s
Maximum: 94.9 Mbit/s

jaray · Sun Feb 13, 2011 2:30 am

So should I try using ether2 as my WAN port and perhaps ether3 my LAN?

Ivoshiee · Sun Feb 13, 2011 10:46 pm

Can anyone confirm that there is throughput issues with any RB750G ethernet ports?
Is there any official MT/RB errata about it?

jaray · Mon Feb 14, 2011 4:34 am

After reading what hapi posted (and translating it lol) it got me thinking. So I changed the gateway/wan to be ether5 and used ether4 to be a wan port.
I then started up a download and absolutely maxed out my 50megs no problem this time. So this is confirmation that there is something going on between ether1 and ether2,ether3,ether4 etc.
There is some issue between the WAN port and the LAN ports in other words. I looked all over and cannot see why this is, but it is.
So, this would be a good issue for any Mikrotik experts to explain what were seeing. This is not right and should not be an issue whatsoever. Firmware differences etc should also NOT be causing an issue like this. I assume enough people are using these routers that I can't be the only person to have this problem.
Any thoughts???

fewi · Mon Feb 14, 2011 4:57 am

I can't reproduce that. There's no difference on my RB750G between routing between ether2 and ether5, and ether1 and ether5. Here the router, and its interface and IP address configuration. Interfaces are still in order - ASA is ether1, LAN is ether2, management is ether5.

[felix@rb750g] > /sys reso pri
                   uptime: 6w4d22h24m53s
                  version: "4.16"
              free-memory: 15400kB
             total-memory: 29936kB
                      cpu: "MIPS 24K V7.4"
                cpu-count: 1
            cpu-frequency: 680MHz
                 cpu-load: 0
           free-hdd-space: 33648kB
          total-hdd-space: 61440kB
  write-sect-since-reboot: 37915
         write-sect-total: 2045255
               bad-blocks: 0%
        architecture-name: "mipsbe"
               board-name: "RB750G"
                 platform: "MikroTik"


[felix@rb750g] > /int et pri
Flags: X - disabled, R - running, S - slave 
 #    NAME      MTU   MAC-ADDRESS       ARP        MASTER-PORT      SWITCH     
 0 R  ASA       1500  00:0C:42:70:12:98 enabled    none             switch1    
 1 R  LAN       1500  00:0C:42:70:12:99 enabled    none             switch1    
 2    433       1500  00:0C:42:70:12:9A enabled    none             switch1    
 3 R  1230      1500  00:0C:42:70:12:9B enabled    none             switch1    
 4 R  manage... 1500  00:0C:42:70:12:9C enabled    none             switch1    

[felix@rb750g] > /ip add pri
Flags: X - disabled, I - invalid, D - dynamic 
 #   ADDRESS            NETWORK         BROADCAST       INTERFACE              
 0   192.168.1.1/24     192.168.1.0     192.168.1.255   LAN                    
 1   172.17.0.1/24      172.17.0.0      172.17.0.255    AP-hotspot             
 2   10.255.255.254/29  10.255.255.248  10.255.255.255  ASA                    
 3   172.31.255.255/32  172.31.255.255  172.31.255.255  loopback0              
 4   10.255.255.233/30  10.255.255.232  10.255.255.235  AP-management          
 5   10.255.255.245/30  10.255.255.244  10.255.255.247  AP-printer             
 6   10.255.255.241/30  10.255.255.240  10.255.255.243  433                    
 7   10.255.255.237/30  10.255.255.236  10.255.255.239  management

I plugged a laptop into ether5 and it pulled 10.255.255.238 via DHCP. I then ran iperf in TCP server mode. I ran iperf in TCP client mode on 192.168.1.103, connected to ether2. I got 155Mbps:

$ iperf -c 10.255.255.238 -t 10 -p 10000 
------------------------------------------------------------
Client connecting to 10.255.255.238, TCP port 10000
TCP window size: 32.8 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.103 port 60936 connected with 10.255.255.238 port 10000
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    185 MBytes    155 Mbits/sec

I disconnected the other gear normally connected to ether1 and plugged directly into it, assigning 10.255.255.249 - I wanted to go directly into the router port. I again ran iperf in TCP server mode, and iperf in TCP client mode on 192.168.1.103 connected to ether2:

$ iperf -c 10.255.255.249 -t 10 -p 10000 
------------------------------------------------------------
Client connecting to 10.255.255.249, TCP port 10000
TCP window size: 32.8 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.103 port 60937 connected with 10.255.255.249 port 10000
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    187 MBytes    157 Mbits/sec

Pretty much the same result. I ran both tests several times, and got around 156Mbps every single time.

jaray · Mon Feb 14, 2011 5:08 am

Well, there's something going on. I started with the 750G at factory defaults and it refused to pull over 29megs. I'm willing to try again but I shouldn't have to mickey mouse around to get this to work well. I'm not asking much of the router to do this.

I am plugging the WAN into a SMC cable modem/gateway that I cannot take out of router mode for crippled ISP firmware. Perhaps there's something up with the SMC ethernet port connecting to the 750G. I really like these MikroTik routers and definitely want to be able to use it.
My ISP is waiting for they're DOCSIS3 standalone modems of which I'll definitely be switching to, but I don't necessarily consider this SMC gateway to be the weak spot as plugging directly into it seems to work fine.
I have another 750G to try just in case, but they are both brand new....

fewi · Mon Feb 14, 2011 5:30 am

Use two computers to test, like I did. I didn't do anything to make this work faster. If it's fast with two computers, it's a problem with the modem. If it is not, try the second RB750G to determine if you have faulty hardware.

RB750G performance

RB750G performance

Re: RB750G performance

Re: RB750G performance

Re: RB750G performance

Re: RB750G performance

Re: RB750G performance

Re: RB750G performance

Re: RB750G performance

Re: RB750G performance

Who is online