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Yalkrif_99781's avatar
Yalkrif_99781
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Mar 07, 2012

Multi cpu preformance

hi

 

 

we are using big-ip 3900 with 4 core's,we are running load tests on http virtual server with iRule and we see that one core (0) gets to 80% cpu while other core's are on 30%.

 

Any idea why this happening ?is there a why to see the Irule usage and in which Cpu?

 

 

 

thanks

 

5 Replies

  • Hi Yalkrif,

     

     

    Is the iRule CMP compatible? If not, that would explain why the first core has higher utilization. You can check using:

     

     

    tmsh show ltm virtual VS_NAME |grep -i cmp

     

    CMP : enabled

     

    CMP Mode : all-cpus

     

     

    If that's not it, what process(es) does top show running with high CPU utilization on CPU0?

     

     

    Aaron
  • How are you running the load tests exactly?

     

     

    If all of the traffic is coming from the same source IP/port and being sent to the same virtual server, it will hash to the same core.

     

     

    Ron

     

  • That CMP wiki page should be a good start. Can you post an anonymized version of the iRule?

     

     

    Aaron
  • I think you should be able to change all the global variables in RULE_INIT to static variables to make the iRule CMP compatible. If you're using any of the currently global variables to store values that change over the course of a connection, you should replace them with session variables.

     

     

    https://devcentral.f5.com/wiki/iRules.static.ashx

     

     

    Aaron