Hipersocket interface runs into netdev watchdog timeout and ksoftirqd spins at 100% CPU
This document (7010153) is provided subject to the disclaimer at the end of this document.
Environment
SUSE Linux Enterprise Server 10 Service Pack 4
Situation
Applies to IBM System z:
After updating the Linux kernel to version 2.6.16.60-0.95.1, NETDEV WATCHDOG transmit timeout kernel messages appear for Hipersocket interfaces under z/VM and the ksoftirqd kernel thread spins at 100% CPU.
After updating the Linux kernel to version 2.6.16.60-0.95.1, NETDEV WATCHDOG transmit timeout kernel messages appear for Hipersocket interfaces under z/VM and the ksoftirqd kernel thread spins at 100% CPU.
Resolution
The newly release kernel package 2.6.16.60-0.97.1 contains a correction for this issue.
Cause
The Linux kernel package 2.6.16.60-0.95.1 introduced a regression that can lead to a wrong count of QDIO error buffers for devices with QIOASSIST ON under z/VM.
Disclaimer
This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.
- Document ID:7010153
- Creation Date: 13-Feb-2012
- Modified Date:16-Mar-2021
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- SUSE Linux Enterprise Server
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