Feedback on the Dell EMC PowerEdge R7525

Asked by Merlin Hartley on 2020-07-06

The kernel in the version of the Xen hypervisor available in Ubuntu 20.04 and 18.04 is not compatible with this hardware - please provide a patch.

Xen 4.13 adds support for Epyc2 CPUs

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Launchpad Janitor (janitor) said : #1

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

Jeff Lane (bladernr) said : #2

Jeff Lane suggests this article as an answer to your question: If you are having problems please refer to the attached faq to get assistance from various support channels.

Beyond that, I am not able to recreate this problem.
ubuntu@cloaker:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04 LTS
Release: 20.04
Codename: focal
ubuntu@cloaker:~$ uname -r
ubuntu@cloaker:~$ uname -a
Linux cloaker 5.4.0-40-generic #44-Ubuntu SMP Tue Jun 23 00:01:04 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
ubuntu@cloaker:~$ xen
xen xen-hptool xen-lowmemd xenbaked xenlockprof xenstore xenstore-ls xenstored xentrace_setsize
xen-bugtool xen-hvmcrash xen-mfndump xencons xenmon xenstore-chmod xenstore-read xentop xenwatchdogd
xen-cpuid xen-hvmctx xen-ringwatch xenconsoled xenperf xenstore-control xenstore-rm xentrace
xen-detect xen-kdd xen-tmem-list-parse xencov xenpm xenstore-exists xenstore-watch xentrace_format
xen-diag xen-livepatch xenalyze xencov_split xenpmd xenstore-list xenstore-write xentrace_setmask
ubuntu@cloaker:~$ sudo xl list
Name ID Mem VCPUs State Time(s)
Domain-0 0 31399 32 r----- 169.6
ubuntu@cloaker:~$ sudo apt-cache policy xen-hypervisor-4.11-amd64
  Installed: 4.11.3+24-g14b62ab3e5-1ubuntu2
  Candidate: 4.11.3+24-g14b62ab3e5-1ubuntu2
  Version table:
 *** 4.11.3+24-g14b62ab3e5-1ubuntu2 500
        500 focal/universe amd64 Packages
        100 /var/lib/dpkg/status

Note I didnt fire up any additional DomUs but Dom0 is up and running and the machine booted. Its been at least 10 years since I last messed around with Xen though, so you'll get better help trying on either the support channels listed in the FAQ or by trying one of the various dedicated Citrix or Xen forums.
FAQ #1945: “Where can I get help or technical support?”.

Jeff Lane (bladernr) said : #3

Sorry, I also forgot to include this bit from /proc/cpuinfo:

processor : 1
vendor_id : AuthenticAMD
cpu family : 23
model : 49
model name : AMD EPYC 7262 8-Core Processor
stepping : 0
microcode : 0x8301034
cpu MHz : 3193.753
cache size : 512 KB
physical id : 0
siblings : 32
core id : 0
cpu cores : 32

SO as you can see, this is the Xen hypervisor and Dom0 running on an EPYC 2 CPU.

Merlin Hartley (merlinhartley) said : #4

Many thanks for your replies.

I don't know why it is failing on my hardware then - I've now built 4.13 and that is fine.