what is IOWAIT showed by the performance monitoring tools ?
Issue
- What is IOWAIT showed by the performance monitoring tools like top, htop, sar, vmstat, mpstat, PCP, collectl etc ?
- What is the source of iowait metric ?
- What is a part of iowait and what is not ?
- does iowait also adds time spent by CPU in memory acquisition, mutex, spinlocks, or scheduler queues ?
Environment
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Enterprise Linux 10
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