[dpdk-dev] DPDK qos support for 40G port

Stephen Hemminger stephen at networkplumber.org
Fri Aug 18 19:21:58 CEST 2017


On Fri, 18 Aug 2017 11:24:12 +0000
"Dumitrescu, Cristian" <cristian.dumitrescu at intel.com> wrote:

> Hi Kevin,
> 
> > Hi Cristian,
> > Sorry to bother again, could you give suggestions/hints of code change to
> > support single 40G port?  Because  in our setup, we will use single 40G port
> > (Intel XL710) as the network interface.
> > 
> > Or is there any workaround to bypass the limitation?(we are not willing to
> > use 4*10G setup)
> > 
> > Thanks.
> >   
> 
> Probably the easiest thing to do as workaround to support single port of 40GbE rate is to change the code so that each credit is equivalent to 2 bytes instead of one. This is likely to result in some scheduling accuracy loss, but it can be implemented relatively quickly while avoiding complex code changes.
> 
> Regards,
> Cristian
> 

Maybe it is time to deprecate existing QoS since it has so many fixed limits
and start a new version which supports up to 400G and many more classes.

Something that integrated better with your new QoS framework.


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