Re: [Xen-devel] Intel-VTd problem

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 09/09/11 23:21, Georg Bege wrote:
> Hello to you guys,
>
> yeah Im also one of the people who seem to have a corrupted BIOS.
> I read already stuff about the issue's with certain vendors -
> and I guess in one particular area it was made clear that even you
> cant do a lot about it you still collect details.
>
> CPU           Intel Core i7 X980
> Mainboard     Asus P6T WS Professional (X58/LGA1333)(bios 1207)
>               rev. 1.01G
>
> I also have two other questions (last time I was testing Xen it was back
> in '06).
>
> A)
>       (XEN) Enabled directed EOI with ioapic_ack_old on!
>       (XEN) ENABLING IO-APIC IRQs
>       (XEN)  -> Using old ACK method
> What does this mean?

There are two methods for ACKing an interrupt from the IO-APIC.  The old
ACK method is faster, but unfortunately breaks certain old chipsets
which didn't follow the spec and tried to be clever working out whether
your OS was new enough to understand what an IO-APIC really was.  As a
result, there are two ACK methods in Xen, so people who run into this
problem can switch their ACK method to the slower one which works on
their hardware.

> B)
> When the hypervisor tries to load my DOM0 it takes a long time until it
> continues the boot process (it hangs somewhere after freeing unused
> memory (loaded the initrd)) - what could that be?
>
> I append my dmesg logs (both XEN and DOM0).
> My host OS is a Gentoo GNU/Linux running 2.6.38-xen kernel.
>
> therion@kali ~ > qlist -Iv xen
> app-emulation/xen-4.1.1
> app-emulation/xen-tools-4.1.1-r1
> sys-kernel/xen-sources-2.6.38
>
>
> cheers

Sorry I cant help with anything else,

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com


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