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

["Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>]

> -----Original Message-----
> From: Stephen Hemminger [mailto:stephen@networkplumber.org]
> Sent: Friday, August 18, 2017 6:22 PM
> To: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>
> Cc: Kevin Yan <Kevin.Yan@mavenir.com>; dev@dpdk.org
> Subject: Re: [dpdk-dev] DPDK qos support for 40G port
> 
> On Fri, 18 Aug 2017 11:24:12 +0000
> "Dumitrescu, Cristian" <cristian.dumitrescu@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.

s/deprecate/improve

I am working to push some updates to librte_meter library, librte_sched to follow.