[Xen-users] cpupool-numa-split broken with pinned cpus?

[Glenn Enright <glenn@xxxxxxxxxxxxxxx>]

Seeing this output, previously (around xen 4.4) it used to work despite 
the pinned cpus.
# xl cpupool-numa-split
libxl: error: libxl.c:5516:libxl_set_vcpuonline: Requested 12 VCPUs, 
however maxcpus is 2!: Success
error on removing vcpus for Domain-0

And then nothing has changed.

# xl cpupool-list
Name               CPUs   Sched     Active   Domain count
Pool-node0          24    credit       y          7

# xl cpupool-list
Name               CPUs   Sched     Active   Domain count
Pool-node0          24    credit       y          7

# xl vcpu-list 0
Name                                ID  VCPU   CPU State   Time(s) 
Affinity (Hard / Soft)
Domain-0                             0     0    0   r--      65.2  0 / all
Domain-0                             0     1    1   -b-      67.8  1 / all

Two issues. One is that the message says success, when no such thing 
occured.
I'm also thinking this may be wrong behaviour, since the number of 
pinned cores is lower the the number of cores on the first node. It may 
be that the test in xl.c around line 5515 should allow this case?
ref https://fossies.org/dox/xen-4.6.1/libxl_8c_source.html

FWIW this machine has dual proc E5-2620 with 64G RAM. the first few 
lines from xl dmesg are...
# xl dmesg
 Xen 4.6.1
(XEN) Xen version 4.6.1 (mockbuild@xxxxxxxxx) (gcc (GCC) 4.4.7 20120313 
(Red Hat 4.4.7-16)) debug=n Tue Apr 19 10:53:28 AEST 2016
(XEN) Latest ChangeSet:
(XEN) Bootloader: GNU GRUB 0.97
(XEN) Command line: dom0_mem=2048M cpufreq=xen dom0_max_vcpus=2 
dom0_vcpus_pin
Happy to test or provide additional info as required, I have this 
machine as a testbed for a wee while. Or be otherwise corrected if this 
is in fact desired behaviour.
Regards, Glenn
http://ri.mu - Startups start here.
Hosting. DNS. Web Programming. Email. Backups. Monitoring.Thanks

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