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Cisco Bug: CSCvi07313 - CPU Hogs in DATAPATH and performance impact with high conn creation rate to one local-host

Last Modified

Jul 25, 2019

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.7(1) 9.8(2)

Description (partial)

Symptom:
When an ASA firewall is creating a high rate of connections that are sourced from or destined to a single IP address, the multiple DATAPATH threads may wait for an extended period of time trying to acquire a lock, assess the data structure and release the lock when reading the local-host data structure. 

This may result in CPU Hogs in DATAPATH threads, high CPU, and potentially leading to packet loss or jitter.

Conditions:
This problem is observed when both of the following occurs:
- The ASA has a high number of connections per second to a specific local-host (IP) object
- The majority of the new connections per second are destined to, or sourced from, that specific local-host object
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