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RE: [Xen-devel] ES7000 x86_64 patch

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] ES7000 x86_64 patch
From: "Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>
Date: Wed, 20 Jul 2005 09:45:54 -0400
Cc: "Davis, Jason" <jason.davis@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Magolan, John F" <John.Magolan@xxxxxxxxxx>, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx>, "Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx>
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Thread-topic: [Xen-devel] ES7000 x86_64 patch
>   1. MAX_IO_APICS is never set to 65 or 129 in 2.6.12. Do you really
> have systems with 129 IO APICs? x86_64 sets it to 128 always; i386 to
> 32.

We currently have systems in our lab with 65 IOAPICs and expect to ship
them in the near future.  As this architecture is further extended,
systems with 129 IOAPICs are feasible.  For the Linux kernel this issue
was tracked by OSDL bugzilla #3754 at
http://bugme.osdl.org/show_bug.cgi?id=3754  Len Brown has applied this
patch to the acpi-test tree.  He had not promoted it into 2.6.12 because
it was very late in the development period for 2.6.12.  We expect that
Len will promote this for 2.6.13

>   2. setup_ioapic_ids_from_mpc: 2.6.12 gates this function on a
> hook, not an explicit CPU version check. Why the difference?

The check on unique IO-APIC ID is changed for
setup-ioapic_ids_from_mpc() in 2.6.13-rc3 to be heuristic also:
2.6%2Ftesting%2Fpatch-2.6.13-rc3.bz2;z=425 , see discussion at
http://www.ussg.iu.edu/hypermail/linux/kernel/0505.1/index.html (search
for "Do not enforce unique APIC ID"). Andi Kleen argued that heuristic
way is better, since it will cover 32 bit platform variety more
accurately. Among x86_64, there is no sub-platform that needs this

>   3. mp_register_ioapic/mp_register_gsi: I see no equivalent of your
> changes in the 2.6.12 tree. Are they awaiting inclusion, or are they
> a 2.6.13-rc tree that I ought to be looking at?

On mp_register_gsi(), the final patch is in 12.6.13-rc3-mm1
-mm1.bz2;z=138 ;
Those are updated IRQ patches that contain fixes for VIA chipset.
The original version of this patch is already in 2.6.13-rc3
2.6%2Ftesting%2Fpatch-2.6.13-rc3.bz2;z=429 ;

Please let me know if you have any more questions about these patches. I
hope you will apply them without waiting for 2.6.13 to be released :-)


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