netdev - Re: QoS hot changes changes (tc)

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Message-ID: <3f847c820906292321w1b85a423o2f5b25badddb9dd2@mail.gmail.com>
Date:	Tue, 30 Jun 2009 08:21:34 +0200
From:	Raúl Hernández <rauhersu@...il.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	"netdev@...r.kernel.org >> Linux Netdev List" 
	<netdev@...r.kernel.org>
Subject: Re: QoS hot changes changes (tc)

Thanks Jarek ! I will try to test them running traffic to see how they
are doing. I miss some documentation related to these stuff :-(.

Regards,
Raul

2009/6/27 Jarek Poplawski <jarkao2@...il.com>:
> Raúl Hernández wrote, On 06/26/2009 03:19 PM:
>
>> Hi there,
>>
>> I am trying to characterize the situation in which we perform a change
>> in the shaping done by the Linux kernel (tc+qdisc), specifically when
>> modifying the bandwidth as a hot change while shaping with a previous
>> bw value. The system I am describing performs shaping per stream
>> (uplink and/or dowinlink or total), just marking the TOS of the ip
>> packet and provisioning the kernel via 'tc' to shape the packets.
>>
>> My question is whether someone has tried to modify bw parameters, ie:
>> move from 90 to 45 kb/s while the queues are already being populated
>> with trafffic .Do not know if the shaper algorithm is able to adjust
>> the bw without service disruption/experiment transitory behavior as I
>> guess the algorithm must have some kind of feedback which depends of
>> the bytes already shaped and the value of the bw itself (ie: leaky
>> bucket).
>>
>> Any experience with this kind of changes :-) ? Thx !
>
> No experience in measuring the effects of such changes, but looking
> into code shows it depends on a shaper algorithm: tbf seems to reset
> the queue, htb doesn't.
>
> Jarek P.
>



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