netdev - Re: [PATCHv4 iproute2 1/2] lib/libnetlink: re malloc buff if size is not enough

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Date:   Sat, 30 Sep 2017 21:54:56 +0800
From:   Hangbin Liu <haliu@...hat.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org, Michal Kubecek <mkubecek@...e.cz>,
        Phil Sutter <phil@....cc>, Hangbin Liu <liuhangbin@...il.com>
Subject: Re: [PATCHv4 iproute2 1/2] lib/libnetlink: re malloc buff if size is
 not enough

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