<html><head></head><body><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">www.anu.net</a> | <a href="http://www.cwik.ch">www.cwik.ch</a></div></div></body></html>