[CentOS-virt] Xen C6 kernel 4.9.13 and testing 4.9.15 only reboots.

On Wed, Apr 19, 2017 at 5:40 AM, Johnny Hughes <johnny at centos.org> wrote:

> On 04/18/2017 12:39 PM, PJ Welsh wrote:
> > Here is something interesting... I went through the BIOS options and
> > found that one R710 that *is* functioning only differed in that "Logical
> > Processor"/Hyperthreading was *enabled* while the one that is *not*
> > functioning had HT *disabled*. Enabled Logical Processor and the system
> > starts without issue! I've rebooted 3 times now without issue.
> > Dell R710 BIOS version 6.4.0
> > 2x Intel(R) Xeon(R) CPU L5639  @ 2.13GHz
> > 4.9.20-26.el7.x86_64 #1 SMP Tue Apr 4 11:19:26 CDT 2017 x86_64 x86_64
> > x86_64 GNU/Linux
> >
>
> Outstanding .. I have now released a 4.9.23-26.el6 and .el7 to the
> system as normal updates.  It should be available later today.
>
> <snip>
>
>
I've verified with a second Dell R710 that disabling Hyperthreading/Logical
Processor causes the primary xen booting kernel to fail and reboot.
Consequently, enabling allows for the system to start as expected and
without any issue:
Current tested kernel was: 4.9.13-22.el7.x86_64 #1 SMP Sun Feb 26 22:15:59
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

I just attempted an update and the 4.9.23-26 is not yet up. Does this
update address the Hyperthreading issue in any way?

Thanks
PJ
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