* Thomas Gleixner <t...@linutronix.de> wrote:
> On Tue, 10 Dec 2013, Mike Galbraith wrote:
> > vogelweide:~/:[130]# turbostat -P -i 60
> > pk cor CPU %c0 GHz TSC SMI %c1 %c3 %c6 CTMP %pc3 %pc6
> > 0.02 2.12 2.26 0 43.40 56.57 0.00 53 33.81 0.00
> > 0 0 0 0.23 2.10 2.26 5 65.47 34.30 0.00 52 10.69 0.00
>
> ...
>
> > That, vs solid >99% pc3 for old 3.0 enterprise kernel. What happened,
> > dunno, kernel called itself master. Whatever, I don't like test bogons,
> > and this is one, so I thought I should let you know. DL980 refuses to
> > come close to the previous result.
>
> Hmm, that's very similar to the issue Len is seing on his quad
> socket WM.
>
> But I can't see it on my dual socket SNB, neither does PeterZ on his
> dual socket WM machine. Heisenbugs ....
>
> Can you offline all cpus except core 0, enable all trace events (nop
> tracer), run "sleep 100" and stop and grab the trace? Please make
> sure that your tracebuffer is big enough to cover the full thing.
I guess because we are facing a Heisenbug it might be prudent to check
that the bug is still present with all those cpus offlined and with
tracing enabled :-/
Thanks,
Ingo
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