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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

CC Dario and Juergen

On Thu, Jun 02, 2016 at 04:01:23PM +1200, Glenn Enright wrote:
> 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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