why this behavior in 3.16 kernel ?

[cool linux]

Hi,

I have executed below script on 3.16 kernel and it took to finish almost
1.30sec to 2 minutes, where as in my older kernel(3.2.30) it took only 3
secs.

================================================
date

for (( i=1; i <= 2000; i++ ))
do
 ip netns exec gmk ip link show > /dev/null
done

date
================================================

Please guide me why this behavior in 3.16 kernel ?

Regards,
Madhu