[LARTC] QoS in Linux

[LARTC] QoS in Linux

[Krishan]

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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.

Please advice me here,

Thanks
-krishan

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Re: [LARTC] QoS in Linux

[Andy Furniss]

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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