[vfio-users] Distinguishing Logical and HT Cores, Cpu-latencies Script Results

[Jeff]

Interesting, relevant results below:

<topology>
      <cells num='1'>
        <cell id='0'>
          <memory unit='KiB'>32839588</memory>
          <cpus num='12'>
            <cpu id='0' socket_id='0' core_id='0' siblings='0'/>
            <cpu id='1' socket_id='0' core_id='0' siblings='1'/>
            <cpu id='2' socket_id='0' core_id='1' siblings='2'/>
            <cpu id='3' socket_id='0' core_id='1' siblings='3'/>
            <cpu id='4' socket_id='0' core_id='2' siblings='4'/>
            <cpu id='5' socket_id='0' core_id='2' siblings='5'/>
            <cpu id='6' socket_id='0' core_id='3' siblings='6'/>
            <cpu id='7' socket_id='0' core_id='3' siblings='7'/>
            <cpu id='8' socket_id='0' core_id='4' siblings='8'/>
            <cpu id='9' socket_id='0' core_id='4' siblings='9'/>
            <cpu id='10' socket_id='0' core_id='5' siblings='10'/>
            <cpu id='11' socket_id='0' core_id='5' siblings='11'/>
          </cpus>
        </cell>
      </cells>
    </topology>

The siblings value is equal to the cpu id, however the core_id looks to be
on to something!
So if that is correct, the pairings would then be cpu id 0 &1  = core_id 0,
cpu id 2 &3  = core_id 1, etc...
Does the output for yours show the siblings value differently (as you
explained it would then be cpuid 0 = siblings 1, etc...)?

On Fri, Mar 4, 2016 at 10:31 AM, Rokas Kupstys <rokups at zoho.com> wrote:

> Run "virsh capabilities" and look for <cpus> tag. It lists core siblings.
> Its what you are looking for right? For me this script also is little
> inconclusive, however seems like libvirt lists siblings right as i cant pin
> one core to two physical cores that are not siblings.
>
>
> On 2016.03.04 16:34, Jeff wrote:
>
> I'm trying to distinguish which cores are which on my Intel 5930k
> processor.
> I ran the script at the console, with no other additional VM's, Docker, or
> plugins running (I'm running UnRAID).
> My output doesn't show any real differences between the cores, all 4's and
> 5's, with the expected 10 to itself.
> I had to modify the script a little to run (locations for netperf and BC),
> but that's really it.
> Nothing else special to report, no messing with governors, or the like.
> The output of the script (pic) is located here
> <https://www.dropbox.com/s/nfyacpvqwy74mi2/IMG_20160302_195344%20%281%29.jpg?dl=0>
> https://www.dropbox.com/s/nfyacpvqwy74mi2/IMG_20160302_195344%20%281%29.jpg?dl=0
>
> Thanks!
>
>
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