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Guidance for moving to http/2

Ross Helfand

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We're looking to enable http/2 for our main application.  I've looked at the documentation (https://docs.netscaler.com/en-us/citrix-adc/current-release/system/http-configurations/configuring-http2.html) and I vaguely understand the steps I need to do to implement this.  Our back-end servers do not support http/2 yet, so I understand that we'll need to do use the "upgrade method" for translation from http/2 to http/1.


I'm more curious about performance impacts on the Netscalers themselves.  We run several VPX devices in parallel, and get roughly 15-18K hits per second at peak to each of our Netscalers, and I was curious to know if there are any white papers/case studies/customer experiences that show the impacts of this translation on CPU/memory on the Netscalers.



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  • 8 months later...

Hi.  I am "bumping" this post to provide some information and see if anyone has any other experience with this.


I ended up opening a support case, and they told me:


Appreciate your patience. I have checked internally and with your leads generally, it shouldn't impact the vpx performance and cpu utilization by the migrating web application from HTTP/1.1 to http/2. 

(and also to proceed with caution and do this during non-Production hours, etc.


This is old data, and not a Production device, but we noticed right away a significant increase in memory utilization.  We did (with caution) enable http2 on some of our lower volume Production VPXs (though we had to roll-back due to application issues) and saw significant memory utilization increases on those as well.


We'd like to move forward again with http2, but we're concerned because of the volume of traffic we receive.


I'd love to hear if anyone has similar experiences or suggestions.  Thanks!




Edited by Ross Helfand
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