[c-nsp] 7206VXR Big CPU Increase After 12.4 Upgrade

[Rodney Dunn]

There are a lot of new features in the switching vectors between
12.3 and 12.4 so you will see an increase in CPU.

In an upcoming 12.4(last)T release that will then be 12.5 mainline
that is being changed so the net result will not be the same
CPU impact as features are enabled that has traditionally been the
case.

Can you post your configuration minus any senstive information in it?

Or unicast it to me...

Rodney

On Tue, Jan 30, 2007 at 02:01:39PM -0000, Mark Taylor wrote:
> Hi,
> 
> We upgraded one of our 7206VXR NPE-G1's from 12.3(12a) to 12.4(12) this 
> morning to cover the recent security releases. We decided to make the major 
> revision jump as we were reloading.
> 
> After the reload the box jumped from 20 percent cpu to 35 percent on the new 
> 12.4(12) image and at the time there was around 75Mbps in each direction of 
> traffic running through the box - so an immediate increase of 15 percent.
> 
> Now there is about 185Mbps each way and cpu is at 65 percent. This would 
> have been about 45 percent before the change of image, so an increase of 20 
> percent.
> 
> This is looking very much like cpu could potentially increase more quickly 
> than traffic. The jump in cpu between images is beginning to concern me a 
> little. Has anybody else experienced this? Is it normal?
> 
> The box is a peering router running IPv4 and OSPF, a full BGP table from one 
> upstream and about 20 other direct peers at a small IX and a few ACLs. CEF 
> is still running.
> 
> I was hoping to get around 350Mbps through the box before running out of cpu 
> and it was looking that way based on 12.3(12a). I guess I could go back to 
> 12.3(22) which is fixed, assuming that the increase in cpu comes with 12.4. 
> I just wanted to find out if this big jump in cpu between releases was 
> normal/expected.
> 
> Any help/experience appreciated.
> Thanks,
> Mark. 
> 
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