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vdelarenal75
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Very low throughput in certain hours

Fri Sep 23, 2011 10:29 pm

Hi, I am experiencing a very strange situation with a X86 server running Mikrotik, at the hours that we have more customers connected the throughput is seriously affected at a point that a connection that in the mornig can pass 15mb only can pass 1mb or less and the strange thing is that my CPU usage shows around 40% free memory 430mb and I have enough bandwith available. So I don't understand what can be causing this. The computer is an IBM server with a P3 HT at 3ghz and 500mb in ram, it is handling around 400 customers with 1mb accounts in hotspot when the problem occurs, 80 filter rules and 130 mangle rules for load balancing 5 wans. When the problem is worst it is handling around 9,500 connections and 55mb of internet traffic.

I think that the problem is because this is too much for the server but why it's only showing 40% cpu load? Any ideas?

Thanks.
 
WirelessRudy
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Re: Very low throughput in certain hours

Sat Sep 24, 2011 1:47 am

Is any wireless involved?

If not, you might print some configs here in the forum so the more skilled guys can take a look at them if they want.
Like now there is not enough information in your post to see what might be a possible cause for this.
Show your appreciation of this post by giving me Karma! Thanks.

Rudy R. Puister

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vdelarenal75
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:17 am

Hi, yes there is wireless involved but when I test directly without the Mikrotik the bandwidth is ok, the problem seems to be on the Mikrotik. I don't know if it could have to do with the packets per second but I guess if that would be the case then the Cpu should be showing 100%, I'm really confused.

Regards.
 
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Belyivulk
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:21 am

Many things can cause this. What version of ROS are you running and what hardware is it running on? Do you have ANY 100mbit switches in the path? What brand / Model?
 
vdelarenal75
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:27 am

Hi, I'm running 5.7 on an IBM X Server Pentium 3HT 3ghz with 512mb in ram, it has 3 4 port ethernet cards and Ubiquiti Airmax APs connected directly to it.
 
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Belyivulk
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:29 am

AH!

What are the 4port ethernet cards?
 
vdelarenal75
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:39 am

3 Matrox with 82551IT intel chipset and one RB44 with via VT610 chipset.
 
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Belyivulk
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:42 am

We have seen a very similar situation with poor performing cards; and IRQ conflicts.

Do you need to have so many 4 port cards in your router?
 
vdelarenal75
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:48 am

Yes I have 5 wans, 5 APs and 1 Link to a remote site with 1 RB1100AH and another 5 APs.
 
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Belyivulk
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:52 am

Ah, well i think; you should get a switch and Vlan back to one or two 1G eths on your router :) that way you can have redundancy + performance. So any NICS on one router (x86 for sure) will perform poorly. Atleast in my experience
 
vdelarenal75
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 6:57 am

Right now that router is handling the load balancing, radius server and 5 hotspots. I was thinking to buy a RB1200 (Since I can't get a RB1100AH since they are sold out) and move the 5 hotspots there, what do you think about that?
 
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Re: Very low throughput in certain hours

Sun Sep 25, 2011 7:12 am

i would try to move as much load away from the router as possible; via a managed switch. This is how we've decided to operate and we have no throughput issues; we can push 4/500 mbit without much issue

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