[Xen-devel] Re: Genapic testing

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 26 May 2005, at 16:47, Puthiyaparambil, Aravindh wrote:

> On an 8-way ES7000, Xen boots successfully but the system loops on the
> "Time went backwards" message while Dom0 comes up.
Does it just happen during boot, or carry on forever? Is dom0 UP or 
SMP? It sounds like IRQ0 is not getting through -- we bump time via 
legacy PIT interrupts. If that doesn't happen then TSC extrapolation 
works for a second or two but then we wrap and time jumps backwards (we 
extrapolate using only least 32 bits of the TSC).
I suggest adding tracing to timer_interrupt() in xen/arch/x86/time.c 
and see whether or not it is getting executed.
> The other thing I noticed was that
> specifying "apic=verbose" on the Xen command line in grub causes the
> default driver to be loaded initially which is alright as the check for
> the ES7000 happens later on.
It seems that Linux has a cmdline conflict between genapic and apic.c 
tracing as to who owns "apic=". Does our behaviour differ from that of 
native Linux? I could change the parameter name of one or the other 
within Xen -- any suggestions for which and to what?
 -- Keir


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