Mailing List Archive: nsp: foundry

Debugging CPU usage on XMR

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remco at signet

Mar 30, 2012, 12:19 AM

Post #1 of 4 (459 views)
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Debugging CPU usage on XMR

Hi list,

We are running a few XMR's in our network where one of them is showing
increased CPU usage on ip_rx. The box is not doing enormous amounts of
traffic (<10Gig) and a similar configuration on a different part of the
network isn't showing any CPU usage problems.
What is the best way to debug CPU issues like this and how can i get a
better insight in the way an XMR uses CPU cycles? A "show cpu" and "show
tasks" shows me what i already know and now i find it very hard to debug.

Any ideas?

Regards,

Remco Bressers
Signet BV
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georgeb at gmail

Mar 30, 2012, 8:12 AM

Post #2 of 4 (436 views)
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Re: Debugging CPU usage on XMR [In reply to]

I've seen that happen with boxes using dynamic cam mode. Are you
using that mode?

On Fri, Mar 30, 2012 at 12:19 AM, Remco Bressers <remco [at] signet> wrote:
> Hi list,
>
> We are running a few XMR's in our network where one of them is showing
> increased CPU usage on ip_rx. The box is not doing enormous amounts of
> traffic (<10Gig) and a similar configuration on a different part of the
> network isn't showing any CPU usage problems.
> What is the best way to debug CPU issues like this and how can i get a
> better insight in the way an XMR uses CPU cycles? A "show cpu" and "show
> tasks" shows me what i already know and now i find it very hard to debug.
>
> Any ideas?
>
> Regards,
>
> Remco Bressers
> Signet BV
> _______________________________________________
> foundry-nsp mailing list
> foundry-nsp [at] puck
> http://puck.nether.net/mailman/listinfo/foundry-nsp
_______________________________________________
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adam at choopa

Mar 30, 2012, 8:51 AM

Post #3 of 4 (435 views)
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Re: Debugging CPU usage on XMR [In reply to]

You can rconsole the MP (and/or LP's) and run the "debug packet capture"
command. This will show you packets hitting the CPU on the module. The
default output is 25 packets. Running a "show cpu lp" will also show
CPU usage on the individual LP's which may make it easier to single out
the source of the CPU increase.

Adam Davenport / adam [at] choopa

On 3/30/2012 3:19 AM, Remco Bressers wrote:
> Hi list,
>
> We are running a few XMR's in our network where one of them is showing
> increased CPU usage on ip_rx. The box is not doing enormous amounts of
> traffic (<10Gig) and a similar configuration on a different part of the
> network isn't showing any CPU usage problems.
> What is the best way to debug CPU issues like this and how can i get a
> better insight in the way an XMR uses CPU cycles? A "show cpu" and "show
> tasks" shows me what i already know and now i find it very hard to debug.
>
> Any ideas?
>
> Regards,
>
> Remco Bressers
> Signet BV
> _______________________________________________
> foundry-nsp mailing list
> foundry-nsp [at] puck
> http://puck.nether.net/mailman/listinfo/foundry-nsp
_______________________________________________
foundry-nsp mailing list
foundry-nsp [at] puck
http://puck.nether.net/mailman/listinfo/foundry-nsp

jeroen.wunnink at atrato-ip

Apr 2, 2012, 1:51 AM

Post #4 of 4 (442 views)
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Re: Debugging CPU usage on XMR [In reply to]

Try disabling icmp redirects globally and/or no ip redirect on ve's

On 3/30/12 5:51 PM, Adam Davenport wrote:
> You can rconsole the MP (and/or LP's) and run the "debug packet
> capture" command. This will show you packets hitting the CPU on the
> module. The default output is 25 packets. Running a "show cpu lp"
> will also show CPU usage on the individual LP's which may make it
> easier to single out the source of the CPU increase.
>
> Adam Davenport / adam [at] choopa
>
>
> On 3/30/2012 3:19 AM, Remco Bressers wrote:
>> Hi list,
>>
>> We are running a few XMR's in our network where one of them is showing
>> increased CPU usage on ip_rx. The box is not doing enormous amounts of
>> traffic (<10Gig) and a similar configuration on a different part of the
>> network isn't showing any CPU usage problems.
>> What is the best way to debug CPU issues like this and how can i get a
>> better insight in the way an XMR uses CPU cycles? A "show cpu" and "show
>> tasks" shows me what i already know and now i find it very hard to
>> debug.
>>
>> Any ideas?
>>
>> Regards,
>>
>> Remco Bressers
>> Signet BV
>> _______________________________________________
>> foundry-nsp mailing list
>> foundry-nsp [at] puck
>> http://puck.nether.net/mailman/listinfo/foundry-nsp
> _______________________________________________
> foundry-nsp mailing list
> foundry-nsp [at] puck
> http://puck.nether.net/mailman/listinfo/foundry-nsp

--

Jeroen Wunnink
Network Engineer
Atrato IP Networks
jeroen.wunnink [at] atrato-ip
Phone: +31 20 82 00 623

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