interrupt shielding

I tried to turn interrupt off on one of the two CPU's. I do
see a huge reducation in the number of interrupt. However,
shouldn't the number of interrupt be 0 ?

$ psrinfo
0       [b]no-intr[/b]   since 04/29/2008 15:28:10
1       on-line   since 04/29/2008 13:53:51

$ mpstat 1
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl 
usr sys  wt idl
  0    0   0    0     [b]4[/b]    0    2    0    0    0    0
    0    0   0   0 100
  1    8   0    1   361  259  177    0    0    0    0   130 
  0   1   0  99
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl 
usr sys  wt idl
  0    0   0    0    [b] 2[/b]    0    0    0    0    0    0
    0    0   0   0 100
  1    0   0    0   366  262  181    0    0    0    0   136 
  0   0   0 100
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl 
usr sys  wt idl
  0    0   0    0    [b]48[/b]    0    0    0    0    0    0
    0    0   0   0 100
  1    9   0   46   365  262  193    3    0    1    0   373 
  1   0   0  99
CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw syscl 
usr sys  wt idl
  0    0   0    0     [b]2[/b]    0    0    0    0    0    0
    0    0   0   0 100
  1    0   0    0   352  250  164    0    0    0    0   115 
  0   0   0 100
 
 
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"psradm -i" stops a CPU from handling device
interrupts, but it may
still take low level interrupts, such as those generated
from
CPU cross calls.  For example, the latter are generated to
force
TLB shootdowns when a page is unmapped.  Note that in the
third
mpstat period, CPU 1 shows 46 xcal's, and CPU 0 shows 48
interrupts.

- Steve

Lieting Yu wrote:
> I tried to turn interrupt off on one of the two CPU's.
I do see a huge reducation in the number of interrupt.
However, shouldn't the number of interrupt be 0 ?
> 
> $ psrinfo
> 0       [b]no-intr[/b]   since 04/29/2008 15:28:10
> 1       on-line   since 04/29/2008 13:53:51
> 
> $ mpstat 1
> CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw
syscl  usr sys  wt idl
>   0    0   0    0     [b]4[/b]    0    2    0    0    0
   0     0    0   0   0 100
>   1    8   0    1   361  259  177    0    0    0    0  
130    0   1   0  99
> CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw
syscl  usr sys  wt idl
>   0    0   0    0    [b] 2[/b]    0    0    0    0    0
   0     0    0   0   0 100
>   1    0   0    0   366  262  181    0    0    0    0  
136    0   0   0 100
> CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw
syscl  usr sys  wt idl
>   0    0   0    0    [b]48[/b]    0    0    0    0    0
   0     0    0   0   0 100
>   1    9   0   46   365  262  193    3    0    1    0  
373    1   0   0  99
> CPU minf mjf xcal  intr ithr  csw icsw migr smtx  srw
syscl  usr sys  wt idl
>   0    0   0    0     [b]2[/b]    0    0    0    0    0
   0     0    0   0   0 100
>   1    0   0    0   352  250  164    0    0    0    0  
115    0   0   0 100
>  
>  
> This message posted from opensolaris.org
> _______________________________________________
> perf-discuss mailing list
> perf-discussopensolaris.org

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