2

I'm running SuperMicro 6048R-E1CR36H Storageserver on Ubuntu Xenial 16.04.03 LTS and Xen

Kernel: 4.4.0-97-generic Xen: xen-hypervisor-4.6-amd64:amd64/xenial-security 4.6.5-0ubuntu1.2

Problem: when I run xl create or xl restore, I get this error message:

libxl: notice: libxl_numa.c:499:libxl__get_numa_candidate: NUMA placement failed, performance might be affected

On other xen-systems I haven't noticed the same message, how would I be able to fix this error?

Here is the xl info. I'm running 24 cores on 2x Xeon E5-2620 v3 chips. https://ark.intel.com/products/83352/Intel-Xeon-Processor-E5-2620-v3-15M-Cache-2_40-GHz

host                   : myserver
release                : 4.4.0-97-generic
version                : #120-Ubuntu SMP Tue Sep 19 17:28:18 UTC 2017
machine                : x86_64
nr_cpus                : 24
max_cpu_id             : 23
nr_nodes               : 2
cores_per_socket       : 6
threads_per_core       : 2
cpu_mhz                : 2400
hw_caps                : bfebfbff:2c100800:00000000:00007f00:77fefbff:00000000:00000021:000037ab
virt_caps              : hvm hvm_directio
total_memory           : 130967
free_memory            : 5
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 6
xen_extra              : .5
xen_version            : 4.6.5
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          : 
xen_commandline        : placeholder
cc_compiler            : gcc (Ubuntu 5.4.0-6ubuntu1~16.04.4) 5.4.0 20160609
cc_compile_by          : stefan.bader
cc_compile_domain      : canonical.com
cc_compile_date        : Fri Oct 13 15:42:52 UTC 2017
xend_config_format     : 4
  • Without more information really it's impossible to say. The required information is how many CPUs of what type do you have? What does 'xl info' report about the CPU? – wazoox Oct 19 '17 at 19:49
  • I edited the question to show xl info. – PHZ.fi-Pharazon Nov 9 '17 at 23:43
0

From xl info output, it looks like you have very little available free memory. You're almost certainly trying to launch a VM with more memory that what's available, that could be the reason for this message (I suppose that some VMs are already running on this host).

I suppose that grep vmx /proc/cpuinfo returns something, too?

  • grep vmx /proc/cpuinfo return empty so I'll check my BIOS settings. There is 128GB of total memory on the system. The command free -m total used free shared buff/cache available Mem: 110146 41342 61781 499 7022 62287 Swap: 3904 3157 746 – PHZ.fi-Pharazon May 27 '18 at 21:11
  • @PHZ.fi-Pharazon so you have virtualization turned off. Probably not a good thing on a virtualization server :) Is your xf info output still the same 6 months later? – wazoox May 28 '18 at 21:37
0

I was getting this message on Debian when I forgot to limit Dom0 memory. For GRUB2 add or edit the following line in the /etc/default/grub file: GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=512M,max:512M"

More about this: https://wiki.xenproject.org/wiki/Xen_Project_Best_Practices

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.