# uname -a 
Linux (none) 2.6.35-rc4 #1 SMP Fri Jul 9 16:15:15 PDT 2010 i686 unknown

# cat /proc/cpuinfo
...
processor       : 23
vendor_id       : GenuineIntel
cpu family      : 6
model           : 44
model name      : Intel(R) Xeon(R) CPU           E5645  @ 2.40GHz
stepping        : 2
cpu MHz         : 2399.870
cache size      : 12288 KB
physical id     : 1
siblings        : 12
core id         : 10
cpu cores       : 6
apicid          : 53
initial apicid  : 53
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 11
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts xtopology nonstop_tsc aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt aes lahf_lm arat tpr_shadow vnmi flexpriority ept vpid
bogomips        : 4801.93
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

# cat /proc/irq/86/smp_affinity 
ffffff

# Header for /proc/interrupts for reference...
#           CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       CPU8       CPU9       CPU10      CPU11      CPU12      CPU13      CPU14      CPU15      CPU16      CPU17      CPU18      CPU19      CPU20      CPU21      CPU22      CPU23

# grep '^  86' /proc/interrupts && sleep 15 && grep '^  86' /proc/interrupts
  86:      87570          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0   PCI-MSI-edge      eth0-TxRx-0
  86:      87577          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0          0   PCI-MSI-edge      eth0-TxRx-0

# echo "fff000" > /proc/irq/86/smp_affinity
# grep '^  86' /proc/interrupts && sleep 15 && grep '^  86' /proc/interrupts
  86:      87627          0          0          0          0          0          0          0          0          0          0          0          2          0          0          0          0          0          0          0          0          0          0          0   PCI-MSI-edge      eth0-TxRx-0
  86:      87627          0          0          0          0          0          0          0          0          0          0          0          9          0          0          0          0          0          0          0          0          0          0          0   PCI-MSI-edge      eth0-TxRx-0

# Notice the difference between the 5410 and the 5645