Re: QoS in Linux

Linux Advanced Routing and Traffic Control

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Krishan wrote:
Hello All, I am interested in QoS provided by Linux, when I looked into IP header I came accross ToS field, also while going more into detail about QoS I found that the QoS based on ToS is serviced thru DiffServ which in turn gives more priority to packets with higher value is ToS field, but I am not able to understand when we finally call dev->hard_start_xmit routine of underlying device type driver, how these packets are given high priority or low priority in the device queue.

I don't think they normally are - unless it's drivers support it. If you want to shape you normally need to use htb/cbq/hfsc/tbf to rate limit below the speed of the device and avoid overfilling it's buffer.

Andy.
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