[AusNOG] CPU - when to upgrade

[Rhys Cuff (Latrobe I.T)]

Hi Guys

Thanks very much for the responses.
We are a very small wireless ISP (around 2000 customers) and run MikroTik router kit (I know I know...)
I can see its normally firewall and routing process's that use most.
Running around 300mbps on the routers in question.
I can certainly upgrade, just wasn’t sure if it was worth it.
MikroTik don’t have much kit that is small and runs 24v.

Thanks again

Rhys




-----Original Message-----
From: Graeme Allen [mailto:mail at graemeallen.com] 
Sent: Friday, April 6, 2018 11:22 AM
To: Rhys Cuff (Latrobe I.T)
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] CPU - when to upgrade

Hi Rhys,

If you are looking at an MRTG style graph, then as Jim points out you are probably looking at a 5 minute rolling average, and the peaks will very likely be much higher and yes possibly impacting performance.

For a more instant view of the CPU, do a "show proc cpu history", this will show you the spikes (assuming csco).

Assuming the box you are using is not just under-powered, you need to look at what is hitting the cpu and see if you can control/remove it.

Chasing "links that don't seem to go as hard as they should", oh man, that's such a can of subjective worms......


On Fri, April 6, 2018 10:51 am, Jim Woodward wrote:
> On 06-04-2018 10:21, Rhys Cuff (Latrobe I.T) wrote:
>
>
> Hi Rhys,
>
>
> If it's a Cisco I have found that once you start hitting 70% you'll 
> start to see Latency creep up, this in turn will likely to have an 
> overall effect on achievable speeds.
>
> If the 70% figure is an average then peaks may be quite a bit higher, 
> I would consider working on a plan to upgrade the device(s) or do the 
> usual process of looking at your configuration to see if you have any 
> misconfigured/redundant ACL's or or routing policies that may be 
> eating into your CPU performance.
>
> Kind Regards,
>
>
> Jim.
>
>
>> FROM: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] ON BEHALF OF 
>> Rhys Cuff (Latrobe I.T)
>> SENT: Friday, April 6, 2018 10:19 AM
>> TO: ausnog at lists.ausnog.net
>> SUBJECT: [AusNOG] CPU - when to upfrade
>>
>>
>> Hi Guys
>>
>>
>> When you have a router and cpu is hitting about 60 - 70% with traffic 
>> load would that impact speeds?
>>
>> I've got a few links that don't seem to go as hard as they should, 
>> but I can't find the 
>> reason._______________________________________________
>>
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