[ofa-general] QoS RFC / how its linked to the networking stack QoS?

[Sean Hefty]

> I wonder how you think the suggested scheme for IPoIB plugs into the 
> existing QoS flow at the Linux network stack. Looking on the man pages 
> of tcp(7) and ip(7) I see that there's a SOL_SOCKET level option of 
> SO_PRIORITY and SOL_IP level option of IP_TOS.

Giving this a little more thought, IPoIB uses a single path to each IP 
destination.  You're asking about per socket ToS, which requires the 
ability to handle multiple paths to each remote IP address.  Both the 
original RFC and my proposal for the host stack limit all IPoIB traffic 
to a single QoS level.

Is there a real need to expand IPoIB ToS capabilities?

- Sean