Andi Kleen wrote:
Yes, it's broken. In fact I removed it in my physflat32 patch
which is needed for 16 core AMD systems. I don't think there
is a generic way to fix it because the XAPIC check breaks
on AMD systems
on the Intel Xeon MP systems, too,
and there is no good way to decide early
on subarchitectures before doing this check. Also it's only
a sanity check for broken BIOS, and in this case it causes more problems
than it solves.
agreed.
ftp://ftp.firstfloor.org/pub/ak/x86_64/x86_64-2.6.13rc3-1/patches/physflat32
That is a beautiful patch, thank you.
Only one small point: I wonder whether it is correct to use the number
of CPUs as criterion for this architecture. AFAICS, the Specs allow
having only 4 CPUS, but giving them APIC IDs e.g. 16,17,18,19. In this
case, physflat32 should be used as well (in particular, the APIC ID
broadcast and mask must be set to 0xff).
Will hopefully be fixed in 2.6.14.
Great,
Martin
--
Martin Wilck Phone: +49 5251 8 15113
Fujitsu Siemens Computers Fax: +49 5251 8 20409
Heinz-Nixdorf-Ring 1 mailto:[email protected]
D-33106 Paderborn http://www.fujitsu-siemens.com/primergy
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