Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
If the interface is congested (queued packets), the LLQ packets, if any, are sent before all other non-LLQ queued packets. LLQ will also rate-limit its traffic to what's been specified when there's interface congestion.
Some examples for your question:
Interface congested:
You could have 0 Mbps LLQ and up to 10 Mbps for everything else.
You could have 1 Mbps LLQ and up to 9 Mbps for everything else.
You could have 5 Mbps LLQ and up to 5 Mbps for everything else.
Interface not congested:
You could have 6 Mbps LLQ and <= 4 Mbps for everything else.
You could have 9 Mbps LLQ and <= 1 Mbps for everything else.
You could have 10 Mbps LLQ and = 0 Mbps for everything else.
