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

[Jeff]

The output of lstopo shows that 0-6, 1-7, etc... are paired, which is what
I originally assumed (as a 4790k is 0-4, 1-5, with similar architecture so
I'd assume similar), but different from the virsh capabilities output
(which did not list siblings correctly for me)
Pic: https://www.dropbox.com/s/m79l36e32f08b8d/out.png?dl=0
XML: https://www.dropbox.com/s/wr93edyszlpcosm/summary.xml?dl=0
So with all of that said, is it safe to say the pairings are 0-6, 1-7, 2-8,
3-9, 4-10, 5-11 for a 5930k?
Just want to make sure.
Thanks!


On Fri, Mar 4, 2016 at 1:09 PM, Jeff <bungee91 at gmail.com> wrote:

> 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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