[squid-users] squid performance is low because only 1 cpu is being used !!!!

hi ,.
i have centos 64 bit with kernel 3.7.5 compiled with tproxy features .
i noted that in rush hour , squid squid guard is bypassing .
i noted that squid is using only 1 cpu .
here is output sample:
===============
[root_at_squid squid-3.3.1]# mpstat -u
Linux 3.7.5 (squid) 03/05/2013 _x86_64_ (24 CPU)

09:10:10 AM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %idle
09:10:10 AM all 5.10 0.00 1.70 14.09 0.00 0.44 0.00
0.00 78.67
[root_at_squid squid-3.3.1]# mpstat -P ALL
Linux 3.7.5 (squid) 03/05/2013 _x86_64_ (24 CPU)

09:10:17 AM CPU %usr %nice %sys %iowait %irq %soft %steal
%guest %idle
09:10:17 AM all 5.10 0.00 1.70 14.09 0.00 0.44 0.00
0.00 78.67
09:10:17 AM 0 8.63 0.00 2.67 30.17 0.00 0.15 0.00
0.00 58.37
09:10:17 AM 1 12.35 0.01 4.50 27.91 0.00 0.44 0.00
0.00 54.79
09:10:17 AM 2 5.51 0.00 1.96 27.65 0.00 0.06 0.00
0.00 64.81
09:10:17 AM 3 7.17 0.00 2.16 22.10 0.00 0.06 0.00
0.00 68.51
09:10:17 AM 4 5.15 0.00 1.93 27.29 0.00 0.06 0.00
0.00 65.56
09:10:17 AM 5 7.63 0.00 1.83 18.54 0.00 0.06 0.00
0.00 71.93
09:10:17 AM 6 5.18 0.00 1.90 28.46 0.00 0.07 0.00
0.00 64.40
09:10:17 AM 7 6.73 0.00 1.45 14.06 0.00 0.05 0.00
0.00 77.70
09:10:17 AM 8 5.19 0.00 1.82 28.47 0.00 0.06 0.00
0.00 64.46
09:10:17 AM 9 6.95 0.00 1.28 10.67 0.00 0.04 0.00
0.00 81.06
09:10:17 AM 10 5.54 0.00 1.78 28.10 0.00 0.06 0.00
0.00 64.51
09:10:17 AM 11 6.68 0.00 1.25 9.02 0.00 0.05 0.00
0.00 83.00
09:10:17 AM 12 1.30 0.00 0.43 9.27 0.00 0.00 0.00
0.00 89.00
09:10:17 AM 13 8.05 0.00 3.83 2.68 0.00 2.61 0.00
0.00 82.83
09:10:17 AM 14 3.37 0.00 1.55 7.86 0.00 0.79 0.00
0.00 86.43
09:10:17 AM 15 6.85 0.00 3.27 2.39 0.00 2.12 0.00
0.00 85.36
09:10:17 AM 16 3.49 0.00 1.61 8.03 0.00 0.83 0.00
0.00 86.03
09:10:17 AM 17 1.78 0.00 0.20 3.02 0.00 0.12 0.00
0.00 94.87
09:10:17 AM 18 1.24 0.00 0.38 8.08 0.00 0.00 0.00
0.00 90.29
09:10:17 AM 19 4.86 0.00 2.17 2.64 0.00 1.51 0.00
0.00 88.82
09:10:17 AM 20 1.15 0.00 0.34 8.03 0.00 0.00 0.00
0.00 90.48
09:10:17 AM 21 5.07 0.00 2.27 2.26 0.00 1.57 0.00
0.00 88.83
09:10:17 AM 22 1.16 0.00 0.35 8.83 0.00 0.00 0.00
0.00 89.66
09:10:17 AM 23 1.75 0.00 0.16 1.75 0.00 0.00 0.00
0.00 96.34
===========================
now i will try to migrate to squid 3.2 to the stable version ,
i had a look on
http://wiki.squid-cache.org/ConfigExamples/MultiCpuSystem
now if i use squid 3.2 stable , will it support smp feature of using
multiple cpu by default or i have compile it with smp enable ?
also ,
do i need more config to operate smp on it is configured by default ???

best regards

with my best regards

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