On Sun, 12 Mar 2006, Venkatesh Pallipadi wrote:
On Sun, Mar 12, 2006 at 02:05:00PM +0100, Krzysztof Oledzki wrote:
On Sun, 12 Mar 2006, Andrew Morton wrote:
Krzysztof Oledzki <[email protected]> wrote:
On Sat, 11 Mar 2006, Andrew Morton wrote:
Krzysztof Oledzki <[email protected]> wrote:
After upgrading to 2.6.16-rc6 I noticed this strange message:
More than 8 CPUs detected and CONFIG_X86_PC cannot handle it.
Use CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.
This is a Dell PowerEdge SC1425 with two P4 Xeons with HT enabled (so with
totoal of 4 logical CPUs).
Please send full dmesg output for the failing kernel, thanks.
Attached.
Which is the most-recently-tested kernel which behaved correctly?
2.6.15.6
OK, thanks. I assume the machine's working OK?
Yes. So far no problems, only this warning.
From my reading, you have CONFIG_HOTPLUG_CPU enabled and the machine has an
APIC.
That is correct.
I'd expect that lots of people would hit that warning but for some
reason they don't - possibly because most APICs don't have sufficiently
high version numbers?
Actually, this warning should be seen on many other systems on well. We
use the bigsmp when there _or_ more than 8 CPUs or CPU_HOTPLUG is used.
So, in that sense the message is wrong, it should also have CPU_HOTPLUG in
there. Or we should make CPU_HOTPLUG depend on GENERIC_ARCH or auto select
GENERIC_ARCH with hotplug at the CONFIG level.
Why? I have exactly 4 HT CPUs (2 cores), no more. I use CPU hotplug so I
can disable or enable any of them when I want to. So, this is a classic
SMP system and 2.6.15 is totally happy with this. Or is there any other
(better?) way to disable/enable CPU (especially second logical CPU from
HT) on running systems?
Best regards,
Krzysztof Olędzki
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