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| Who | When | What | Removed | Added |
|---|---|---|---|---|
| Red Hat Bugzilla | 2023-03-07 07:03:50 UTC | Pool ID | sst_virtualization_hwe_rhel_9 | |
| Red Hat One Jira (issues.redhat.com) | 2023-03-07 07:06:29 UTC | Link ID | Red Hat Issue Tracker RHELPLAN-150884 | |
| Mario Casquero | 2023-03-07 07:07:04 UTC | Assignee | virt-maint | imammedo |
| jingzhao | 2023-03-07 07:10:14 UTC | QA Contact | virt-bugs | chayang |
| Mario Casquero | 2023-03-07 07:14:22 UTC | CC | zhenyzha | |
| Chao Yang | 2023-03-07 09:16:31 UTC | QA Contact | chayang | mcasquer |
| Nitesh Narayan Lal | 2023-03-07 14:41:13 UTC | Keywords | Triaged | |
| Mario Casquero | 2023-03-10 10:44:59 UTC | Flags | needinfo?(imammedo) | |
| CC | imammedo | |||
| Igor Mammedov | 2023-03-10 12:05:48 UTC | Flags | needinfo?(imammedo) | |
| Igor Mammedov | 2023-03-21 14:49:22 UTC | CC | babu.moger, bandan.das | |
| Chao Yang | 2023-03-23 02:26:47 UTC | Flags | needinfo?(mcasquer) | |
| Mario Casquero | 2023-03-24 07:34:04 UTC | Flags | needinfo?(mcasquer) | needinfo?(imammedo) |
| Igor Mammedov | 2023-03-27 12:39:24 UTC | Flags | needinfo?(imammedo) | |
| Babu Moger | 2023-03-29 19:27:05 UTC | CC | pkodamat, wei.huang2 | |
| Bandan Das | 2023-04-14 15:20:52 UTC | CC | bandan.das | bdas |
| Chao Yang | 2023-04-17 05:41:26 UTC | Flags | needinfo?(mcasquer) | |
| Mario Casquero | 2023-05-03 07:30:30 UTC | Flags | needinfo?(mcasquer) | |
| Mario Casquero | 2023-05-08 07:15:47 UTC | Flags | needinfo?(imammedo) | |
| Igor Mammedov | 2023-05-17 15:18:03 UTC | CC | yduan | |
| Igor Mammedov | 2023-05-23 12:28:21 UTC | Flags | needinfo?(imammedo) | needinfo?(babu.moger) |
| Resolution | --- | WONTFIX | ||
| Doc Type | If docs needed, set a value | Known Issue | ||
| Status | NEW | CLOSED | ||
| Doc Text | Cause: EPYC CPU model encodes NUMA nodes mapping within CPU's APIC ID. However it isn't handled in QEMU correctly and previous attempts to fix it has lead to overly complicated solution that was hard to maintain, and eventually effort to make it right was abandoned. Consequence: Guest kernel will print warnings during boot: sched: CPU #4's llc-sibling CPU #3 is not on the same node! [node: 1 != 0]. Ignoring dependency. WARNING: CPU: 4 PID: 0 at arch/x86/kernel/smpboot.c:415 topology_sane.isra.0+0x6b/0x80 Workaround (if any): use another CPU model then EPYC Result: Mis-mapping CPUs to NUMA nodes might affect performance. | |||
| Last Closed | 2023-05-23 12:28:21 UTC | |||
| Yanhui Ma | 2023-05-25 09:38:00 UTC | CC | jherrman, yama | |
| Flags | needinfo?(jherrman) | |||
| Babu Moger | 2023-05-31 14:19:36 UTC | Flags | needinfo?(babu.moger) | |
| Igor Mammedov | 2023-05-31 15:34:15 UTC | Flags | needinfo?(babu.moger) | |
| Babu Moger | 2023-05-31 15:47:39 UTC | Flags | needinfo?(babu.moger) | |
| Jiri Herrmann | 2023-06-05 09:21:16 UTC | Flags | needinfo?(jherrman) | needinfo?(imammedo) needinfo?(yama) |
| Doc Text | Cause: EPYC CPU model encodes NUMA nodes mapping within CPU's APIC ID. However it isn't handled in QEMU correctly and previous attempts to fix it has lead to overly complicated solution that was hard to maintain, and eventually effort to make it right was abandoned. Consequence: Guest kernel will print warnings during boot: sched: CPU #4's llc-sibling CPU #3 is not on the same node! [node: 1 != 0]. Ignoring dependency. WARNING: CPU: 4 PID: 0 at arch/x86/kernel/smpboot.c:415 topology_sane.isra.0+0x6b/0x80 Workaround (if any): use another CPU model then EPYC Result: Mis-mapping CPUs to NUMA nodes might affect performance. | .NUMA node mapping not working correctly on AMD EPYC CPUs QEMU does not handle NUMA node mapping on AMD EPYC CPUs correctly. As a result, the performance of virtual machines (VMs) with these CPUs might be negatively impacted if using a NUMA node configuration. In addition, the VMs display a warning similar to the following during boot. ---- sched: CPU #4's llc-sibling CPU #3 is not on the same node! [node: 1 != 0]. Ignoring dependency. WARNING: CPU: 4 PID: 0 at arch/x86/kernel/smpboot.c:415 topology_sane.isra.0+0x6b/0x80 ---- To work around this issue, do not use AMD EPYC CPUs for NUMA node configurations. |
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| Igor Mammedov | 2023-06-05 09:53:14 UTC | Flags | needinfo?(imammedo) | |
| Yanhui Ma | 2023-06-06 11:30:15 UTC | Flags | needinfo?(yama) | |
| Lucie Vařáková | 2023-07-12 12:23:30 UTC | Docs Contact | jherrman |
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