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Linux kernel bugs
Brice Goglin edited this page Mar 2, 2018
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24 revisions
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* hwloc 1.11.8 has encountered what looks like an error from the operating system.
*
* L3 (cpuset 0x60000060) intersects with NUMANode (P#0 cpuset 0x3f00003f nodeset 0x00000001) without inclusion!
* Error occurred in topology.c line 1088
Fixed in 4.14 in commit
commit 2b83809a5e6d619a780876fcaf68cdc42b50d28c
Author: Suravee Suthikulpanit <[email protected]>
Date: Mon Jul 31 10:51:59 2017 +0200
x86/cpu/amd: Derive L3 shared_cpu_map from cpu_llc_shared_mask
For systems with X86_FEATURE_TOPOEXT, current logic uses the APIC ID
to calculate shared_cpu_map. However, APIC IDs are not guaranteed to
be contiguous for cores across different L3s (e.g. family17h system
w/ downcore configuration). This breaks the logic, and results in an
incorrect L3 shared_cpu_map.
Instead, always use the previously calculated cpu_llc_shared_mask of
each CPU to derive the L3 shared_cpu_map.
Backported in upstream 4.13.16.
Each dual-NUMA package is reported as two single-NUMA package.
Fixed in 3.18 in commit
commit cebf15eb09a2fd2fa73ee4faa9c4d2f813cf0f09
Author: Dave Hansen <[email protected]>
Date: Thu Sep 18 12:33:34 2014 -0700
x86, sched: Add new topology for multi-NUMA-node CPUs
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* Hwloc has encountered what looks like an error from the operating system.
*
* object (L3 cpuset 0x000003f0) intersection without inclusion!
The fix was NEVER pushed to Linux. Use hwloc 1.11.2 and set HWLOC_COMPONENTS=x86 in your environment to work around the issue.