Flashes (Alerts)
Abstract
On Power Systems with HASH MMU mode, kdump support is limited to a maximum of 192 cores (1536 CPUs). Use of kdump with cores greater than 192 results in memory allocation failure during early boot. This limitation is due to the RMA memory allocations during early boot in HASH MMU mode.
Content
Linux Releases Affected
All releases that support more than 192 cores (1536 CPUs).
All releases that support more than 192 cores (1536 CPUs).
IBM Systems Affected
Large configuration systems with around 192 cores (1536 CPUs) or more.
Large configuration systems with around 192 cores (1536 CPUs) or more.
Symptoms
System fails to boot with memory allocation failures during early boot process.
System fails to boot with memory allocation failures during early boot process.
Workaround
Use FADump crash recovery mechanism instead of kdump to get around this problem. Alternatively, opt for Radix MMU mode, where applicable, to avoid this limitation.
Use FADump crash recovery mechanism instead of kdump to get around this problem. Alternatively, opt for Radix MMU mode, where applicable, to avoid this limitation.
Fix Outlook
IBM is working on the fix. The fix will come as part of a future RHEL or SLES release. If a fix pack is needed before the next release, open a support ticket with Red Hat or SUSE.
IBM is working on the fix. The fix will come as part of a future RHEL or SLES release. If a fix pack is needed before the next release, open a support ticket with Red Hat or SUSE.
See SUSE bug: 1190812
See Red Hat bug: 2011841
See Red Hat bug: 2011841
I/O device impacted
None
None
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Document Information
Modified date:
06 December 2021
UID
ibm16520388