netdev - Re: Packetlost when "tc qdisc del dev eth0 root"

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Date:	Tue, 15 Jan 2008 19:11:09 +0300
From:	slavon@...telecom.ru
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Badalian Vyacheslav <slavon@...telecom.ru>, netdev@...r.kernel.org
Subject: Re: Packetlost when "tc qdisc del dev eth0 root"

I understand. Thanks!

> Badalian Vyacheslav wrote:
>> Hello all. Have packetlost when do "tc qdisc del dev eth0 root".
>>
>> look:
>>
>> slavon ~ # ping -f 87.255.1.134
>> PING 87.255.1.134 (87.255.1.134) 56(84) bytes of data.
>> .
>> .....................................................................................................................................................................................................................................................................   
>> .
>> --- 87.255.1.134 ping statistics ---
>> 60811 packets transmitted, 60544 received, 0% packet loss, time 39528ms
>> rtt min/avg/max/mdev = 0.203/0.579/3227.655/13.124 ms, pipe 219,   
>> ipg/ewma 0.650/2.197 ms
>>
>> Its normal?
>
> Yes, packets in the old qdisc are lost.
>
>> Maybe if tc do changes - need create second queue (hash of rules or  
>>  how you named it?) and do changes at it. Then replace old queue   
>> rules by created new.
>> Logic -
>> 1. Do snapshot
>> 2. Do changes in shapshot
>> 3. All new packets go to snapshot
>> 4. If old queue not have packets - delete it.
>> 5. Snapshot its default.
>
>
> That doesn't really work since qdiscs keep internal state that
> in large parts depends on the packets queued. Take the qlen as
> a simple example, the new qdisc doesn't know about the packets
> in the old one and will exceed the limit.



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