Re: [Xen-users] domU machines hang when Hyperthreading enabled in BIOS

[Vincent Hanquez <vincent.hanquez@xxxxxxxxxxxx>]

On Tue, Jan 24, 2006 at 12:10:12PM +0100, Samuel Torton wrote:
> I can't get rid of an annoying domU machines hanging issue with
> Hyperthreading enabled in my BIOS.

it seems we have lots of random issues with HT, please can you add your
information at the end of bug 432, so that nothing get lost ?

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=432

> - 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 !!! :-(

please provide both bootlog; to know exactly where it hangs is good to
know for us.

> 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 !

this is probably not a configuration problem.

> Thank you in advance...
> ... please, don't advise me I have to disable Hyperthreading in BIOS !;-)

I'm no fan of HT, that what I'ld do on any personal HT cpu I'ld have ;)

-- 
Vincent Hanquez

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