On 8/1/06, Fabio Guarneri <fabioguarneri@xxxxxxxxx> wrote:
Why CONFIG_NR_CPUS=2 ??
The dual core CPU has 2 cores with hyper threading. Try to change it.
CONFIG_NR_CPUS=4
After going through the BIOS menu, I couldn't see that it had multi
threading support. Hence this parameter was set to 2. Anyways, even after
setting this to 4, the result is the same. All interrupts are delivered to CPU0.
-
Regards,
Ranjan
Regards,
Fabio.
2006/8/1, Ranjan Sinha <rnjn.sinha@xxxxxxxxx>:
>
Hi,
I have an Intel dual core machine but all interrupts are received on CPU 0.
I have built kernel 2.6.15.7 and following is an excerpt from my config file
CONFIG_X86_GOOD_APIC=y
CONFIG_X86_INTEL_USERCOPY=y
CONFIG_X86_USE_PPRO_CHECKSUM=y
CONFIG_X86_TSC=y
CONFIG_HPET_TIMER=y
CONFIG_HPET_EMULATE_RTC=y
CONFIG_SMP=y
CONFIG_NR_CPUS=2
CONFIG_SCHED_SMT=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_PREEMPT_BKL=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
Yet when I look at /proc/interrupts this is what I get
CPU0 CPU1
0: 171883 0 IO-APIC-edge timer
1: 3797 0 IO-APIC-edge i8042
8: 3 0 IO-APIC-edge rtc
9: 3 0 IO-APIC-level acpi
12: 240 0 IO-APIC-edge i8042
14: 8227 0 IO-APIC-edge libata
15: 2 0 IO-APIC-edge libata
50: 0 0 IO-APIC-level uhci_hcd:usb3
58: 0 0 IO-APIC-level uhci_hcd:usb4
66: 6748 0 PCI-MSI eth0
185: 7 0 IO-APIC-level yenta
225: 150 0 IO-APIC-level uhci_hcd:usb1, ehci_hcd:usb5
233: 28122 0 IO-APIC-level uhci_hcd:usb2, HDA Intel
NMI: 0 0
LOC: 171791 171790
ERR: 0
MIS: 0
Why is the interrupt count on CPU1 0? Have I missed something in the
kernel configuration file or is this how a dual core machine behave
actually.
-
Thanks and Regards,
Ranjan
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