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question in "cpu_affinity_map" directive

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hi i read about it !
=============
# SMP support disabled.

#  TAG: cpu_affinity_map
#       Usage: cpu_affinity_map process_numbers=P1,P2,... cores=C1,C2,...
#                   
#       Sets 1:1 mapping between Squid processes and CPU cores. For example,
#       
#           cpu_affinity_map process_numbers=1,2,3,4 cores=1,3,5,7
#                   
#       affects processes 1 through 4 only and places them on the first   
#       four even cores, starting with core #1.
#         
#       CPU cores are numbered starting from 1. Requires support for
#       sched_getaffinity(2) and sched_setaffinity(2) system calls.
#         
#       Multiple cpu_affinity_map options are merged.   
#       
#       See also: workers
#Default:
=================================

it says that the core start with number 1 !!
why i cant user core # 0 ???

here is mpstat from my server :
=========================================================================
root@drx:~$ mpstat -P ALL
Linux 3.3.8-1-amd64-vyatta (vyatta)     10/26/13        _x86_64_        (24
CPU)

23:27:21     CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal 
%guest   %idle
23:27:21     all    3.23    0.00    2.68    1.67    0.00    1.40    0.00   
0.00   91.02
23:27:21       0   11.83    0.00   11.29    8.16    0.00    0.91    0.00   
0.00   67.81
23:27:21       1    6.12    0.00    5.82    3.08    0.00    4.27    0.00   
0.00   80.71
23:27:21       2    9.56    0.00    6.77    4.32    0.00    6.72    0.00   
0.00   72.63
23:27:21       3    2.61    0.00    2.47    1.59    0.00    0.07    0.00   
0.00   93.27
23:27:21       4   10.03    0.00    6.43    3.86    0.00    7.39    0.00   
0.00   72.29
23:27:21       5    1.95    0.00    2.09    1.35    0.00    0.01    0.00   
0.00   94.59
23:27:21       6   10.04    0.00    6.23    3.59    0.00    7.26    0.00   
0.00   72.88
23:27:21       7    1.77    0.00    1.97    1.23    0.00    0.01    0.00   
0.00   95.02
23:27:21       8    9.79    0.00    6.07    3.35    0.00    7.20    0.00   
0.00   73.59
23:27:21       9    1.65    0.00    1.89    1.11    0.00    0.01    0.00   
0.00   95.34
23:27:21      10    4.39    0.00    2.93    3.63    0.00    0.02    0.00   
0.00   89.03
23:27:21      11    1.62    0.00    1.97    0.99    0.00    0.01    0.00   
0.00   95.41
23:27:21      12    0.53    0.00    0.52    0.31    0.00    0.00    0.00   
0.00   98.64
23:27:21      13    0.41    0.00    0.45    0.08    0.00    0.00    0.00   
0.00   99.06
23:27:21      14    0.86    0.00    1.16    0.56    0.00    0.01    0.00   
0.00   97.42
23:27:21      15    2.21    0.00    3.31    0.21    0.00    0.01    0.00   
0.00   94.26
23:27:21      16    0.39    0.00    0.47    0.44    0.00    0.00    0.00   
0.00   98.70
23:27:21      17    0.57    0.00    0.81    0.10    0.00    0.00    0.00   
0.00   98.51
23:27:21      18    0.27    0.00    0.29    0.57    0.00    0.00    0.00   
0.00   98.87
23:27:21      19    0.27    0.00    0.37    0.19    0.00    0.00    0.00   
0.00   99.17
23:27:21      20    0.24    0.00    0.25    0.59    0.00    0.00    0.00   
0.00   98.92
23:27:21      21    0.24    0.00    0.33    0.22    0.00    0.00    0.00   
0.00   99.20
23:27:21      22    0.22    0.00    0.25    0.57    0.00    0.00    0.00   
0.00   98.96
23:27:21      23    0.22    0.00    0.30    0.22    0.00    0.00    0.00   
0.00   99.25
=========================================
my corse start with 0  not with 1 ????!!!

why 0 is not allowed??


regards




-----
Dr.x
--
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