<html><head></head><body>Solved.<div><br></div><div>For the archives:</div><div><br></div><div>Noticed in xl info output that only 1 core was recognised, even though nr_cpus should show 16 on this box.<br><div><br></div><div>Tried rebooting and selecting the old .34 kernel, console printed "smpboot: do_boot_cpu failed(-1) to wakeup CPU#1" and CentOS failed to boot. Powered down the box fully and started back up with the latest .44 kernel and everything is working fine now.</div><div><br></div><div>Not enough of an expert to know if this is a bug in the kernel, a problem with the BIOS, bad hardware, a completely random stroke of bad luck or a cosmic sign. Happy it works now. If anyone has experienced this and has any suggestions they would be received with gratitude.</div><div><br></div><div>Chris</div><div><br>--<br>
Chris Wik<br>
Anu Internet Services<br>
<a href="http://www.anu.net">www.anu.net</a> | <a href="http://www.cwik.ch">www.cwik.ch</a><br><br><br><div><strong>
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Chris Wik <chris@anu.net>
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<centos-virt@centos.org>
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28/02/2017 11:36 PM
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[CentOS-virt] NUMA placement failed, performance might be affected
<br><br><blockquote class="mori" style="margin:0 0 0 .8ex;border-left:1px solid #CCC;padding-left:1ex;"><div><div>I just did a yum update on a CentOS 7 / Xen 4.6 server which took me from kernel-3.18.34-20.el7.x86_64 -> kernel-3.18.44-20.el7.x86_64</div></div><div><br></div>After rebooting, the following notice is printed immediately upon xl create'ing a domain: libxl: notice: libxl_numa.c:499:libxl__get_numa_candidate: NUMA placement failed, performance might be affected<div><br></div><div>Indeed performance is significantly degraded. This issue didn't happen on the older kernel. Any ideas where it came from or how it can be fixed?<br><div><br></div><div><div># cat /proc/cpuinfo </div><div>processor<span style="white-space:pre"> </span>: 0</div><div>vendor_id<span style="white-space:pre"> </span>: GenuineIntel</div><div>cpu family<span style="white-space:pre"> </span>: 6</div><div>model<span style="white-space:pre"> </span>: 63</div><div>model name<span style="white-space:pre"> </span>: Intel(R) Xeon(R) CPU E5-2637 v3 @ 3.50GHz</div><div>stepping<span style="white-space:pre"> </span>: 2</div><div>microcode<span style="white-space:pre"> </span>: 0x36</div><div>cpu MHz<span style="white-space:pre"> </span>: 3500.090</div><div>cache size<span style="white-space:pre"> </span>: 15360 KB</div><div>physical id<span style="white-space:pre"> </span>: 0</div><div>siblings<span style="white-space:pre"> </span>: 1</div><div>core id<span style="white-space:pre"> </span>: 0</div><div>cpu cores<span style="white-space:pre"> </span>: 1</div><div>apicid<span style="white-space:pre"> </span>: 0</div><div>initial apicid<span style="white-space:pre"> </span>: 0</div><div>fpu<span style="white-space:pre"> </span>: yes</div><div>fpu_exception<span style="white-space:pre"> </span>: yes</div><div>cpuid level<span style="white-space:pre"> </span>: 15</div><div>wp<span style="white-space:pre"> </span>: yes</div><div>flags<span style="white-space:pre"> </span>: fpu de tsc msr pae mce cx8 apic sep mca cmov pat clflush acpi mmx fxsr sse sse2 ss ht syscall nx lm constant_tsc arch_perfmon rep_good nopl nonstop_tsc eagerfpu pni pclmulqdq monitor est ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm ida arat epb pln pts dtherm fsgsbase bmi1 avx2 bmi2 erms xsaveopt</div><div>bugs<span style="white-space:pre"> </span>:</div><div>bogomips<span style="white-space:pre"> </span>: 7000.18</div><div>clflush size<span style="white-space:pre"> </span>: 64</div><div>cache_alignment<span style="white-space:pre"> </span>: 64</div><div>address sizes<span style="white-space:pre"> </span>: 46 bits physical, 48 bits virtual</div><div>power management:</div><div><br></div><div><div># xl info</div><div>host : ****.localdomain</div><div>release : 3.18.44-20.el7.x86_64</div><div>version : #1 SMP Tue Oct 25 11:42:52 UTC 2016</div><div>machine : x86_64</div><div>nr_cpus : 1</div><div>max_cpu_id : 15</div><div>nr_nodes : 2</div><div>cores_per_socket : 1</div><div>threads_per_core : 1</div><div>cpu_mhz : 3500</div><div>hw_caps : bfebfbff:2c100800:00000000:00007f00:77fefbff:00000000:00000021:000037ab</div><div>virt_caps : hvm hvm_directio</div><div>total_memory : 130958</div><div>free_memory : 28003</div><div>sharing_freed_memory : 0</div><div>sharing_used_memory : 0</div><div>outstanding_claims : 0</div><div>free_cpus : 0</div><div>xen_major : 4</div><div>xen_minor : 6</div><div>xen_extra : .3-7.el7</div><div>xen_version : 4.6.3-7.el7</div><div>xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 </div><div>xen_scheduler : credit</div><div>xen_pagesize : 4096</div><div>platform_params : virt_start=0xffff800000000000</div><div>xen_changeset : Wed Feb 15 02:12:22 2017 -0600 git:c359c64-dirty</div><div>xen_commandline : placeholder dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all</div><div>cc_compiler : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-11)</div><div>cc_compile_by : mockbuild</div><div>cc_compile_domain : centos.org</div><div>cc_compile_date : Wed Feb 15 12:18:43 UTC 2017</div><div>xend_config_format : 4</div></div><div><br></div><div><br></div><div>Thanks in advance,</div><div><br></div><div>Chris</div><br>--<br>
Chris Wik<br>
Anu Internet Services<br>
<a href="http://www.anu.net" target="_blank">www.anu.net</a> | <a href="http://www.cwik.ch" target="_blank">www.cwik.ch</a></div></div><br><br>_______________________________________________
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