[PLUG] help with /proc/cpuinfo

[VY]

Thanks for your reply.
The reason I highlighted this field is exactly what you brought up -- this
number is different in the other
machines I have in our data center.  All the others say "4" but this one
machine is "25".
Not sure how I can look up firmware or whether specter mitigation has been
applied.  Need to look those up.

thanks


On Wed, Apr 24, 2019 at 7:36 PM Ben Koenig <techkoenig at gmail.com> wrote:

> On 4/24/19 5:40 PM, VY wrote:
> > Dear All
> >
> > I need some help with reading the output of /proc/cpuinfo.
> >
> > We have several machines and they are all supposedly identical Intel Xeon
> > machines. 4 CPUs each and identical Linux version.
> > One of the machines are reporting VERY high load consistently.
> > They are all running identical applications and I don't see any
> difference
> > in load.
> >
> > However, when I look at /proc/cpuinfo, this "very high load" box is
> saying:
> >
> >     apicid : 25
> >
> >    initial apicid : 25
> >
> >
> >
> > All the other machines are reporting 4 for this number.
> >
> > Does it matter what this number say?  I looked online but cannot quite
> tell
> > whether it matters or not.
> >
> >
> >
> > thanks
> >
> >
> > -v
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>
>
> the apicid might be unrelated to what you are troubleshooting. My
> understanding is that it's an identifier used to keep track of logical
> cores.
>
> If this number is the same on all your other systems then all that says
> is that this CPU might be from a different lot.
>
> It could also suggest a difference in microcode, or BIOS firmware, which
> you can identify through more effective means.
>
>
> I would compare some of the other details, such as the various levels of
> firmware that govern software->hardware interactions. Maybe this box is
> running a different spectre mitigation?
>
>
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