netdev - Re: [bug report or not] ping6 will lost packets when ping6 lots of ipv6 address

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Message-ID: <CAJFZqHyTfmvUQVAHf872_syRizxjQ6GfyWgb3nBnq0d-zQYP8A@mail.gmail.com>
Date:	Wed, 14 Oct 2015 14:44:22 +0800
From:	Li RongQing <roy.qing.li@...il.com>
To:	Martin KaFai Lau <kafai@...com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: [bug report or not] ping6 will lost packets when ping6 lots of
 ipv6 address

On Wed, Oct 14, 2015 at 12:11 AM, Martin KaFai Lau <kafai@...com> wrote:
> On Tue, Oct 13, 2015 at 08:46:49PM +0800, Li RongQing wrote:
>> 1. in a machine, configure 3000 ipv6 address in one interface
>>
>> for i in {1..3000}; do ip -6 addr add 4001:5013::$i/0 dev eth0; done
>>
>>
>> 2. in other machine, ping6 the upper configured ipv6 address, then
>> lots of lost packets
>>
>> ip -6 addr add 4001:5013::0/64 dev eth0
>> for i in {1..2000}; do ping6 -q -c1 4001:5013::$i; done;
>>
>> 3. increasing the gc thresh can handles these lost
>>
>> sysctl -w  net.ipv6.neigh.default.gc_thresh1=2000
>> sysctl -w  net.ipv6.neigh.default.gc_thresh2=3000
>> sysctl -w  net.ipv6.neigh.default.gc_thresh3=4000
>> sysctl -w net.ipv6.route.gc_thresh=3000
>> sysctl -w net.ipv6.route.max_size =3000
> Which kernel is used in this test?

all version, I think this should not a bug, this test will lead to
that the neigh number is
larger than net.ipv6.neigh.default.gc_thresh3, and can not allocate
new neigh, and ping
will lost packets.

Thanks


-Roy
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