Re: NUMA placement failed, performance might be affected

"-=X.L.O.R.D=-" <xlord.sl@xxxxxxxxx> · Thu, 2 Mar 2017 00:18:58 +0800

Chris,
Check your cpuinfo from flag which did not indicate any ‘VMX’ support for your CPU virtualization support on the board.

Xlord

From: CentOS-virt [mailto:centos-virt-bounces@xxxxxxxxxx] On Behalf Of Chris Wik
Sent: Wednesday, March 1, 2017 7:07 AM
To: Discussion about the virtualization on CentOS <centos-virt@xxxxxxxxxx>
Subject: Re:  NUMA placement failed, performance might be affected

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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