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Citrix ADC VPX 1000 Management CPU always using 100%. CPU Yield setting change from default to Yes, still valid?


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Citrix ADC VPX 1000 Management CPU always using 100%. As per the below carlstalhood article, we can change CPU Yield to YES from Default. But this change required VPX 200 and lower only. If I do the same change on VPX 1000, is it effective? or is it hamper VPX performance? Please suggest.

NetScaler 12 packet engine consumes 100% of the hypervisor CPU. VPX 200 and lower only have one packet engine, so it’s probably consuming around 50% CPU.
https://www.carlstalhood.com/netscaler-12-system-configuration/#100cpu
Citrix ADC VPX packet engine consumes 100% of the hypervisor CPU. VPX 200 and lower only have one packet engine, so it’s probably consuming around 50% CPU.
https://www.carlstalhood.com/system-configuration-citrix-adc-13/#100cpu

https://support.citrix.com/article/CTX229555-- is also recommending the same setting change. But not given any supported VPX Version.

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  • 2 weeks later...

On a VPX, the management CPU should NOT normally run at 100%.... if it is, then you have a big problem!

 

However, it is expected that the Packet Engine CPU will always run at 100%, and it is THAT CPU that the CPU yield adjusts.if Netscaler is quiet, then gets a sudden burst of traffic, then 

 

I use Xenserver, and I can see the 2 CPUs individually: without CPU Yield, one CPU is running at 100% the other at just a few %. When I enable CPU tiels, they are both running at just a few percent. Clearly, if your virtualisation platform doesn't show individial CPU usage, then it will say that you are using just over 50% of your allocated CPUs.

 

I guess that if yout netscaler is quiet, then gets a sudden burst of traffic, there could be a momentary lack of performance until the NS gets its CPU (kinda like hitting the gas pedal on a car....). Thus, for a performace critical installation, do NOT use CPU Yield. But great for a test box...

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