Luca wrote:
> On 6/11/07, Avi Kivity <[email protected]> wrote:
>> Luca wrote:
>> >>
>> >> I've managed to reproduce this on kvm-21 (it takes many boots for
>> this
>> >> to happen, but it does eventually).
>> >
>> > Hum, any clue on the cause?
>>
>> From what I've seen, it's the new Linux clocksource code.
>
> Actually I tried forcing the PIT (and any other combination of
> tsc,acpi_pm,jiffies) as the clocksource, without success.
>
Well, there's lots of APIC stuff going on when it hangs.
>> > Should I test older versions?
>>
>> They're unlikely to be better. Instead, it would be best to see what
>> the guest is doing.
>>
>> I suggest downloading the source rpm for the kernel, building it, and
>> sprinkling printk()s until we know exactly what source the guest is
>> executing at the time of the hang.
>
> Ok, will do. Meanwhile I discovered that the kernel on the boot cd
> (the one that hangs) is compiled for i586, while the one installed on
> disk is for i686 (this one works).
Ah.
>
> i686 has this options enabled:
>
> +CONFIG_X86_GOOD_APIC=y
> +CONFIG_X86_USE_PPRO_CHECKSUM=y
> +CONFIG_X86_TSC=y
>
> but disabling tsc on the command line doesn't make any difference. Is
> it possible that KVM is choking on some instruction not used by the
> i686 kernel?
Unlikely, as then the hang would occur all the time instead of randomly.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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