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

[Jeff]

Thanks, that worked well!
lstopo and the output of these commands are in agreement.
I consider this mystery (for me anyway) solved.

On Sat, Mar 5, 2016 at 8:57 AM, Samuel Holland <samuel at sholland.org> wrote:

> On 03/04/2016 05:37 PM, Jeff wrote:
>
>> 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)
>>
>
> If you want to get the information directly from the kernel, try:
>
> grep . /sys/bus/cpu/devices/*/topology/core_id
> grep . /sys/bus/cpu/devices/*/topology/thread_siblings_list
>
> 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?
>>
>
> That seems to be generally how it works. My Xeon X5675 also has:
>
> /sys/bus/cpu/devices/cpu0/topology/thread_siblings_list:0,6
> /sys/bus/cpu/devices/cpu1/topology/thread_siblings_list:1,7
> /sys/bus/cpu/devices/cpu2/topology/thread_siblings_list:2,8
> /sys/bus/cpu/devices/cpu3/topology/thread_siblings_list:3,9
> /sys/bus/cpu/devices/cpu4/topology/thread_siblings_list:4,10
> /sys/bus/cpu/devices/cpu5/topology/thread_siblings_list:5,11
> /sys/bus/cpu/devices/cpu6/topology/thread_siblings_list:0,6
> /sys/bus/cpu/devices/cpu7/topology/thread_siblings_list:1,7
> /sys/bus/cpu/devices/cpu8/topology/thread_siblings_list:2,8
> /sys/bus/cpu/devices/cpu9/topology/thread_siblings_list:3,9
> /sys/bus/cpu/devices/cpu10/topology/thread_siblings_list:4,10
> /sys/bus/cpu/devices/cpu11/topology/thread_siblings_list:5,11
>
> I know that in the past, there could be some variation between boots,
> but that seems to no longer be the case.
>
> Just want to make sure.
>>
> > Thanks!
>
> --
> Regards,
> Samuel Holland <samuel at sholland.org>
>
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