[AusNOG] CPU - when to upgrade

[Matthew Smee]

One other thing worth mentioning, since you said firewall process, is that device throughput is dependant on what services or features you enable on it. Not every device has dedicated chips/ASICs for every function, or in some cases they do but you'll only get a fraction of the line throughput if you enable things like firewall, inspection, etc. 
Might be worth checking the data sheet and see what you've enabled versus what's advertised.
...And then take about 30% off the vendor advertised number for the real expected result :-).

Cheers,
Matt.

-----Original Message-----
From: AusNOG <ausnog-bounces at lists.ausnog.net> On Behalf Of Rhys Cuff (Latrobe I.T)
Sent: Friday, 6 April 2018 11:44 AM
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] CPU - when to upgrade

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._______________________________________________
>>
> AusNOG mailing list
> AusNOG at lists.ausnog.net
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>


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