[Xen-users] 4.2 on an HP Z820

[Tim Nicholson <nichot20@xxxxxxxxx>]

I have a Z820 with a single 4 core hyperthreaded Processor on which I
have installed openSUSE/Xen 4.2

In native boot up dmesg lists:-

0.044679] smpboot: CPU0: Intel(R) Xeon(R) CPU E5-2643 0 @ 3.30GHz (fam:
06, model: 2d, stepping: 07)
[...]
0.154060] smpboot: Booting Node   0, Processors  #1 #2 #3 #4 #5 #6 #7 OK
[    0.257167] Brought up 8 CPUs
[    0.257171] smpboot: Total of 8 processors activated (52670.73 BogoMIPS)

...but in Xen I get:-

(XEN) Processor #0 6:13 APIC version 21
(XEN) Processor #2 6:13 APIC version 21
(XEN) Processor #4 6:13 APIC version 21
(XEN) Processor #6 6:13 APIC version 21

Implying that the hyperthreading "cpu's" are being "ignored"

A slightly older Z800 does not exhibit this behaviour, so I am wondering
if this is a "feature" of the efi boot process, or if Xen is ignoring
the hyperthreading as it may conflict its own thread scheduler.

Looking through the archives suggests that efi may cause issues and I am
wondering if this is one of them. Does anyone else have any experience
of this?

-- 
Tim

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