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jmay
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Routerboard Max CPU usage

Fri Nov 13, 2015 7:21 pm

Maybe a dumb question, but at what point should I consider upgrading my main router? I have an RB1100AHx2 that peaks around 75% CPU during high usage which is about 550megs. Will these function fine up to 100% or should I start looking to upgrade it? I'm not really having any issues with it, except that the dude is failing bandwidth graphs during peak time which I am not yet sure if it's a dude problem or a busy router problem.

Any thoughts?
 
upower3
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Re: Routerboard Max CPU usage

Fri Nov 13, 2015 8:11 pm

Maybe a dumb question, but at what point should I consider upgrading my main router? I have an RB1100AHx2 that peaks around 75% CPU during high usage which is about 550megs. Will these function fine up to 100% or should I start looking to upgrade it? I'm not really having any issues with it, except that the dude is failing bandwidth graphs during peak time which I am not yet sure if it's a dude problem or a busy router problem.

Any thoughts?
I'd rather don't bother at all, since you can a) use higher cpu frequency (System -> Routerboard -> Settings), and 2) try to use different stat gather method.
 
jarda
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Fri Nov 13, 2015 8:37 pm

You can also try the fasttrack to offload the cpu.
 
jmay
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Re: Routerboard Max CPU usage

Sat Nov 14, 2015 12:20 am

Ok, my boss gave me permission to upgrade the router. We'd like to get one with an SPF cage and dump the fiber converter that's there now. I'm looking at the CCR1009-8G-1S-1S+, do you think that would be a significant upgrade from the RB1100AHx2?
 
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Re: Routerboard Max CPU usage

Sat Nov 14, 2015 4:56 am

Ok, my boss gave me permission to upgrade the router. We'd like to get one with an SPF cage and dump the fiber converter that's there now. I'm looking at the CCR1009-8G-1S-1S+, do you think that would be a significant upgrade from the RB1100AHx2?

i think its a good upgrade

rb1100ahx2 cost 350us
CCR1009-8G-1S-1S+ cost 495us

ccr1009 cost 1.5x the 1100ahx2 but has 3.0x the performance

but

you have to look thinking in future, i think its a good exercise to evaluate your network needs and future grow to estimate if a CCR1036-12G-4S (995us) or a CCR1036-8G-2S+ (1095us) can be a better investment because you can have a better performance per dollar ratio and more future growing capacity

for example CCR1036-12G-4S cost 3.0x the rb1100ahx2 but has 12.0x the performance

the CCR1036-8G-2S+ 100us extra cost gives you the trade of 8 gigabit ports by 2 10gigabit ports
 
jmay
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Re: Routerboard Max CPU usage

Mon Nov 16, 2015 5:48 pm

Thanks for responding! We ordered the ccr1009. I'd love to have gone bigger but I don't set my own budgets unfortunately. :( We are in the business of selling internet so every dollar I spend is a dollar that does not make it to my bosses pocket, lol.
 
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Re: Routerboard Max CPU usage

Mon Nov 16, 2015 9:15 pm

Good choice! CCR1009 is becoming a great workhorse and powerful router when you need a good balance of price/performance.

As a general rule for CPU utilization, when we design networks, we always try to plan for a router to never go over 50% sustained CPU utilization in a short window. Certainly there will be times when CPU will momentarily spike to 100%, but to maintain a very stable network, not overloading your routers and planning for growth is key.

The more critical your uptime is, the lower you should keep your overall CPU utilization when designing for capacity. In the years since I've switched from mostly working with Cisco, to working with MikroTik most weeks, I've seen a definite correlation between high sustained CPU utilization and issues that are hard to track down. MikroTik routers are much happier then they are not being driving to the limits on a production network. We have some networks that we plan to never exceed 25% utilization and use the appropriate CCR even if it is overkill for the bandwidth needed.

Don't join the watchdog club of frequent rebooters....keep your CPU usage small :-)
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jmay
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Re: Routerboard Max CPU usage

Mon Nov 16, 2015 10:26 pm

Good to hear! Thanks.
Does anybody know exactly how mikrotik divies up the multi-cores for processing? With my dual core routers I poll both cores and I've noticed at times one might be 100% while the other is near 0%, then at other times they are even. It could be that the dude is not polling at identical times I suppose, but I was curious how that worked.

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