Hi,
I can't get rid of an annoying domU machines hanging issue with
Hyperthreading enabled in my BIOS.
Hardware config: IBM x325 series
 2 * CPUs Intel Xeon 3.06 Ghz
Xen version: 3.0.0
Kernel version: 2.6.12.6
Linux distrib: Debian Sarge 3.1 r1
I run 1 domU machine on my dom0, here is my Xen config:
 . xen0:
 /etc/xen/xend-config.sxp : (dom0-num-cpus 0)
 . xenU:
 /etc/xen/myxenU.cfg : vcpus = 2
- First case: . BIOS Hyperthreading : DISABLED
 . xen0 kernel config : SMT enabled
 . xenU kernel config : SMT enabled or disabled (whatever)
 When I reboot the physical machine, and run the command "xm list" :
 . dom0 is visible and works fine
 --> I see 2 cpus.
 . domU is visible and works fine
 --> I see 2 cpus;
 I can console the xenU machine and work inside.
- Second case: . BIOS Hyperthreading : ENABLED
 . xen0 kernel config : SMT enabled
 . xenU kernel config : SMT enabled or disabled (whatever)
 --> When I reboot the physical machine, and run the command "xm list" :
 . dom0 is visible and works fine
 --> I see 4 cpus.
 . domU is visible and SEEMS to work fine (!)
 --> I see 2 cpus;
 If I console the xenU machine, I see the machine
 has booted but is hanged before finishing the boot !!! :-(
Would you have any idea, any clue ? Do you have any experience ?
 - Where to search in log files in order to detect the problem ?
 - Which kernel parameter would I have forgotten ?
 - I don't even know whether the problem comes from xen0 or xenU kernel
conf !
 - etc... ?
Thank you in advance...
... please, don't advise me I have to disable Hyperthreading in BIOS !;-)
Regards,
Samuel
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