Increased softirq usage in RHEL 7.3 and RHEL 7.4 kernels when compared to prior RHEL 7 kernels; related to setting CPU affinity (pinning)
Issue
- After updating the kernel from 3.10.0-327.el7 series to a newer 3.10.0-514.el7 or 3.10.0-693.el7 series kernel, application performance suffers. This is seen in an environment where IRQs are pinned to specific CPUs.
Environment
- Red Hat Enterprise Linux 7
- kernel-3.10.0-327.el7
- kernel-3.10.0-514.el7
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