This KB is in relevance to vSRX deployments in GCP, particularly regarding performance impact and communication reliability.

CPU utilization remains abnormally low (around ~2%) and observed performance degradation for UDP traffic.

Environment details: vSRX deployed on Google Cloud Platform (GCP)

This is  related to a condition where the vSRX dataplane may enter a low-power/sleep state, resulting in:

• Reduced CPU utilization visibility
• Degraded packet processing performance
• Noticeable impact particularly for UDP traffic, which is sensitive to processing latency
• This behavior is applicable to virtualized vSRX environments, including deployments in cloud platforms such as GCP.

Workaround:

Disable dataplane sleep mode using the following configuration:

 # set security forwarding-options no-allow-dataplane-sleep

Please refer: https://prsearch.juniper.net/problemreport/PR1602606