Hi,
I am trying to disable the local APIC timer interrupts on x86_64
machine, but finding that it just doesn't work. I am trying to find out
if I am doing something wrong or if there is a problem with these CPUs.
I have a dual-cpu x86_64 machine and I have booted up with 2.6.11 kernel
and nmi_watchdog=2. I called disable_APIC_timer() function, which seems
to be setting the 16th bit of the APIC timer register, which is what the
AMD document suggests to disable the timer. This function is in fact
__init, but I changed it not to be so. I noticed that we continue to see
local APIC timer interrupts on the very CPU where I called
disable_APIC_timer. I have a printk in smp_apic_timer_interrupt() to
verify this. Booting the machine with maxcpus=1 didn't have any effect
on the outcome. CPUs are of the following type:
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 5
model name : AMD Opteron(tm) Processor 248
stepping : 8
cpu MHz : 2193.510
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext lm
3dnowext 3dnow
bogomips : 4325.37
TLB size : 1088 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp
Please let me know if I am doing something wrong and if I should do
something else to disable local APIC timer interrupts. I need to disable
these interrupts to solve a problem in LKCD dumping.
smp_apic_timer_interrupt eventually calls update_process_times, which is
causing problem in a particular LKCD dump case I am looking at.
Please copy me on your reply, as I have not subscribed to the list.
Thanks and regards,
Sripathi.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
