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 Post subject: GNS3 routing performance test
PostPosted: Thu Aug 28, 2014 7:54 am 
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Joined: Thu Aug 28, 2014 7:38 am
Posts: 2
Hello,

I was trying to test Cisco IOS routers performance in GNS3.
But the results obtained make me think that Ive done something wrong.
Could anyone assist ?

Details about tests done:
http://sclabs.blogspot.com/2014/08/gns3-router-performance.html

Excuse me if that question was already discussed and for link to site outside of this forum.




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 Post subject: Re: GNS3 routing performance test
PostPosted: Thu Aug 28, 2014 10:03 pm 
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Joined: Fri Mar 05, 2010 11:33 am
Posts: 1494
Location: Australia
If I read your results properly:

Case1 - traffic through two c3700 routers
PC--c3725Rtr--c3725Rtr--PC

Resulting throughput: 1.1134 Mbs

Case 2 - traffic through just ONE 3600 router
PC--c3600Rtr--PC

Resulting throughput: 135.2339 Mbs
~100 times better than two c3725 routers!!! AMAZING - you got more that 100Mb/s through 100Mb/s interfaces

Case 3 - traffic through just ONE 3725 NM-16ESW switch
PC--c3725Switch (NM-16ESW)--PC

Resulting throughput: 123.8164 Mbs
~Again 100 times better than two c3725 routers!!! AMAZING - you got more that 100Mb/s through 100Mb/s interfaces

Case 4 - traffic through a physical switch - no specs of switch given (would be nice to know what we are comparing here)
Result: 123.8164 Mb/s - clearly if this is a physical switch, then it must be using Gigabit interfaces.

Conclusion:

In the test environment, GNS3/dynamips OUTPERFORMED a physical switch using gigagbit interfaces in a single switch or single router scenario.

Great work - thanks for the posting, and you are always welcome to link your own articles to this forum when relevant. (I do it all the time)
[Note: I would have commented on your blog, but it seems you have the ability to post replies turned off]

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RedNectar
http://rednectar.net
@rednectarchris
GNS3 WorkBench-a VMware image of Ubuntu with GNS3 and VPCS installed and a collection of exercises/labs


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 Post subject: Re: GNS3 routing performance test
PostPosted: Fri Aug 29, 2014 6:08 am 
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Joined: Thu Aug 28, 2014 7:38 am
Posts: 2
in short the results are the following:
case1: PC--R--R--PC 1.1134 Mbps throughput routing performance
case2: PC--R--PC 17.4797 Mbps
case3: PC--SW--PC 135.2339 Mbps
case4: PC--real_network--PC 123.8164 Mbps

the ideea was to understand why throughput routing performance is so low and what can be made to improve it.


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 Post subject: Re: GNS3 routing performance test
PostPosted: Fri Aug 29, 2014 11:26 am 
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Joined: Fri Mar 05, 2010 11:33 am
Posts: 1494
Location: Australia
I'm not quite sure what you mean by "throughput routing performance is so low". I think 1Mb/s is pretty awesome for what dynamips is - an emulator. A glorified interpreter, that reads binary code (compiled for the MIPS processor) and finds a way to "emulate" it on your PC (running an Intel or AMD processor).

Dynamips was never designed to or ever claimed to "simulate" a real world scenario. But it does a great job of allowing you to test your Cisco configurations and even connect with "simulators" like VIrtualBox and other emulators like Qemu.

So if you want to test say that your traffic is getting the right QoS markings, go right ahead. But it you want to test QoS, don't bother trying. This is the wrong tool. And as your figures show, trying to measure throughput is also totally flawed, as you demonstrated by being able to pass more than 100Mb/s through a 100Mb/s interface.

If you really want to measure performance on a software based router, you would be best to use a software router, like the Nexus CSR 1000V (seems you might have the hardware to run it) These may help http://brezular.com/2013/08/18/cisco-csr-1000v-installation-on-qemu-virtual-machine/; http://forum.gns3.net/topic4220.html; http://blog.ine.com/2013/04/15/installing-the-cloud-services-router-1000v-in-esxi-5-1/


BTW - sorry i misread your results for Case 2.



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RedNectar
http://rednectar.net
@rednectarchris
GNS3 WorkBench-a VMware image of Ubuntu with GNS3 and VPCS installed and a collection of exercises/labs


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