Unless I've mis-understood all the emails and reports about this, it affects 
low-bandwidth queues, not low-bandwidth interfaces.
In other words, limiting traffic to 50Mbps on a 1Gb link will work fine, 
limiting it to 50kbps on the same link will not.

Yes/no?

-Adam

On August 21, 2014 12:03:12 PM CDT, Stuart Henderson <s...@spacehopper.org> 
wrote:
>On 2014-08-21, Federico Giannici <giann...@neomedia.it> wrote:
>> We are using a firewall/qos server with a lot of HFSC queues.
>> We have just switched to the new queueing system of 5.5.
>> We'd like to get rid of custom kernels because now there is no longer
>
>> the limit of 64 HFSC classes, but I have recently read that there are
>
>> still limits to the efficacy of the queueing system with the standard
>
>> 100 HZ in systems with high speed connections.
>>
>> Is this still true?
>> If so, is there some way to calculate, or at least have an idea, of
>the 
>> minimum HZ value required for a given output speed and queues
>parameters?
>>
>> Thanks.
>>
>>
>
>Queues with the default HZ are OK with high speed connections. The
>problem
>is with *low* speed connections. I don't know how to calculate values
>though.

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