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https://www.mjmwired.net/kernel/Documentation/nmi_watchdog.txt
For SMP kernels, APIC support gets compiled in automatically. For 17 UP, enable either CONFIG_X86_UP_APIC (Processor type and features -> Local 18 APIC support on uniprocessors) or CONFIG_X86_UP_IOAPIC (Processor type and 19 features -> IO-APIC support on uniprocessors) in your kernel config.
https://dev.archive.openwrt.org/ticket/18928.html
CC trunk x86 compilation stops at interactive prompt "IO-APIC support on uniprocessors" Reported by: ... (PREEMPT_VOLUNTARY) 3. Preemptible Kernel (Low-Latency Desktop) (PREEMPT) choice[1-3]: 1 Local APIC support on uniprocessors (X86_UP_APIC) [Y/?] (NEW) y IO-APIC support on uniprocessors (X86_UP_IOAPIC) [N/y/?] (NEW) Attachments (0) Oldest ...
http://lkml.iu.edu/hypermail/linux/kernel/0008.1/1106.html
Despite selecting the "APIC and IO-APIC support on uniprocessors" kernel config option, I've had trouble getting 2.4.0-test6 to correctly enable the local APIC.
https://github.com/spotify/linux/blob/master/Documentation/nmi_watchdog.txt
features -> IO-APIC support on uniprocessors) in your kernel config. CONFIG_X86_UP_APIC is for uniprocessor machines without an IO-APIC. CONFIG_X86_UP_IOAPIC is for uniprocessor with an IO-APIC. [Note: certain: kernel debugging options, such as Kernel Stack Meter or Kernel Tracer, may implicitly disable the NMI watchdog.] For x86-64, the needed ...
http://lkml.iu.edu/hypermail/linux/kernel/0404.3/0646.html
[PATCH] 2.6.5-rc2: Configure APIC default enabled state From: James Cleverdon Date: Tue Apr 27 2004 ... here: the IO-APIC will be used automatically. ... + bool "APIC support on uniprocessors defaults to off" + depends on !SMP && X86_UP_APIC + help
https://github.com/ValveSoftware/steamos_kernel/commit/38a1dfda8e77d7ba74c94d06d8bc41ba98a4bc8c
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http://lkml.iu.edu/hypermail/linux/kernel/0303.1/1928.html
>[*] IO-APIC support on uniprocessors > I think the subject is a bit misleading: There seems to be a problem with interrupt routing if he enables IO-APIC support, both with a Broadcom nic and a 3com nic. Either the MP table that is supplied by the bios is incorrect [wouldn't be a big surprise - I think Linux is the only OS that looks at MP tables
http://lkml.iu.edu/hypermail/linux/kernel/0303.1/2003.html
Mar 15, 2003 · > >[*] IO-APIC support on uniprocessors > > > I think the subject is a bit misleading: > There seems to be a problem with interrupt routing if he enables IO-APIC > support, both with a Broadcom nic and a 3com nic. > Either the MP table that is supplied by the bios is incorrect [wouldn't
http://lkml.iu.edu/hypermail/linux/kernel/0709.2/0391.html
I am experiencing the similar problem on my Acer Aspire 5000 laptop - once in a while a bunch of "APIC error on CPU0: 40(40)" messages are showing up in dmesg.
https://serverfault.com/questions/74672/why-should-i-enable-io-apic-in-virtualbox
Note: Enabling the I/O APIC is required for 64-bit guest operating systems, especially Windows Vista; it is also required if you want to use more than one virtual CPU in a virtual machine. However, software support for I/O APICs has been unreliable with some operating systems other than Windows.
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