Re: [Xen-devel] Unknown interrupt on x86_64 Xen on ES7000 x86_64

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Aug 2005, at 19:10, Puthiyaparambil, Aravindh wrote:

> I am getting an "Unknown Interrupt" message with changeset 6050 on the
> ES7000 x86_64 box running x86_64 SLES9 SP2 RC3. The system dies after
> that. Any idea why this could be happening?
> I am not sure if this is related to
> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=122.
Definitely a different bug, but this one shouldn;t be hard to track 
down. Probably you are talking a page fault very early during boot. I'd 
suggest working out where this occurs by adding printk statements 
(probably paging_init() in arch/x86/x86_64/mm.c would be a good place 
to start).
> When I tried the same changeset on my Dell PowerEdge 470 box I am 
> seeing
> something totally different and very scary :-)
> Is anybody else seeing this?
I think the HPET on your system is not working for some reason! Please 
try removing the call to init_hpet() from init_platform_timer() in 
arch/x86/time.c -- just fall back to init_pit(). You should then see 
'Platform timer is xxxMHz PIT' rather than 'Platform timer is xxxMHz 
HPET' in Xen's boot log.
If that fixes your problem (very likely) then we can try and work out 
why the HPET is failing to work. Perhaps see whether native Linux 
successfully uses it, for example.
 -- Keir


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