Hi Stephen,
On Fri, Sep 29, 2017 at 10:54:40AM -0700, Stephen Hemminger wrote:

Doubling the number of system calls per message is not going to make
users with 5,000,000 routes or 1000 vlans, or 10,000 tunnels happy.
Please rethink this.

I tried to add 2500 vlans and 70,000 routes. Then show the result. The
time looks reasonable.

# ip link show | wc -l
5024

# time ip link show > /dev/null

real    0m0.218s
user    0m0.007s
sys     0m0.210s

# time iproute2/ip/ip link show > /dev/null

real    0m0.221s
user    0m0.008s
sys     0m0.212s

# time ip addr show > /dev/null

real    0m0.299s
user    0m0.094s
sys     0m0.205s

# time iproute2/ip/ip addr show > /dev/null

real    0m0.302s
user    0m0.099s
sys     0m0.202s

# ip -6 route show | wc -l
704458

# time ip -6 route show > /dev/null

real    0m5.400s
user    0m0.947s
sys     0m4.453s

# time iproute2/ip/ip -6 route show > /dev/null

real    0m5.404s
user    0m1.070s
sys     0m4.333s


Thanks
Hangbin