Re: NUMA placement failed, performance might be affected

[Chris Wik <chris@xxxxxxx>]

Solved.

For the archives:

Noticed in xl info output that only 1 core was recognised, even though nr_cpus should show 16 on this box.

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.

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.

Chris

--
Chris Wik
Anu Internet Services
www.anu.net | www.cwik.ch

From: Chris Wik <chris@xxxxxxx>
To: <centos-virt@xxxxxxxxxx>
Sent: 28/02/2017 11:36 PM
Subject: NUMA placement failed, performance might be affected

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

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

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?

# cat /proc/cpuinfo 

processor : 0

vendor_id : GenuineIntel

cpu family : 6

model : 63

model name : Intel(R) Xeon(R) CPU E5-2637 v3 @ 3.50GHz

stepping : 2

microcode : 0x36

cpu MHz : 3500.090

cache size : 15360 KB

physical id : 0

siblings : 1

core id : 0

cpu cores : 1

apicid : 0

initial apicid : 0

fpu : yes

fpu_exception : yes

cpuid level : 15

wp : yes

flags : 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

bugs :

bogomips : 7000.18

clflush size : 64

cache_alignment : 64

address sizes : 46 bits physical, 48 bits virtual

power management:

# xl info

host                   : ****.localdomain

release                : 3.18.44-20.el7.x86_64

version                : #1 SMP Tue Oct 25 11:42:52 UTC 2016

machine                : x86_64

nr_cpus                : 1

max_cpu_id             : 15

nr_nodes               : 2

cores_per_socket       : 1

threads_per_core       : 1

cpu_mhz                : 3500

hw_caps                : bfebfbff:2c100800:00000000:00007f00:77fefbff:00000000:00000021:000037ab

virt_caps              : hvm hvm_directio

total_memory           : 130958

free_memory            : 28003

sharing_freed_memory   : 0

sharing_used_memory    : 0

outstanding_claims     : 0

free_cpus              : 0

xen_major              : 4

xen_minor              : 6

xen_extra              : .3-7.el7

xen_version            : 4.6.3-7.el7

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 

xen_scheduler          : credit

xen_pagesize           : 4096

platform_params        : virt_start=0xffff800000000000

xen_changeset          : Wed Feb 15 02:12:22 2017 -0600 git:c359c64-dirty

xen_commandline        : placeholder dom0_mem=1024M,max:1024M cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all

cc_compiler            : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-11)

cc_compile_by          : mockbuild

cc_compile_domain      : centos.org

cc_compile_date        : Wed Feb 15 12:18:43 UTC 2017

xend_config_format     : 4

Thanks in advance,

Chris

--
Chris Wik
Anu Internet Services
www.anu.net | www.cwik.ch

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