Cisco Bug: CSCun84751 - Preventing CMCI Storm (Corrected Machine Check Interrupt)
Jul 15, 2020
- Cisco Unified Computing System
Known Affected Releases
Symptom: A host OS experiences slowness due to excessive interrupt handling. /var/log/messages will record : Feb 21 01:10:59 linuxhost kernel: mce: [Hardware Error]: Machine check events logged Feb 21 01:11:46 linuxhost kernel: CMCI storm detected: switching to poll mode Feb 21 01:12:16 linuxhost kernel: CMCI storm subsided: switching to interrupt mode Feb 21 01:12:50 linuxhost kernel: CMCI storm detected: switching to poll mode Feb 21 01:13:20 linuxhost kernel: CMCI storm subsided: switching to interrupt mode Conditions: 1. OS has CMCI manually enabled. 2. A DIMM enters a degraded state by experiencing correctable errors.
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