[ovs-discuss] Help on QoS Enhancement of OVS

[Ben Pfaff]

On Wed, Aug 13, 2014 at 09:58:09PM +0530, Monica Gawas wrote:
> Ben Flaff : "What do you see as the most important deficiency?"
>
> Being quite the beginners in this stuff, we found some very basic deficiencies like :
> 1.     QoS implementations in ovs only support a simple rate limiting , rather than intelligent QoS with a minimum bandwidth
>         guarantee. With rate limiting, each queue is assigned a specific amount of bandwidth that cannot be exceeded. But what if  
>         the queue is being under-utilized ?
> 2.     Uncontrolled incoming traffic at the device, to a VM that is sharing a network device, can severely impact the performance of
>         other VMs because the decision to drop an incoming packet is taken after the device has received the packet. This could 
>         potentially cause a denial of service attack on the VMs sharing the device.

OVS (on Linux) uses Linux kernel provided QoS.  It sounds like you want
to develop new Linux queuing disciplines.  That's nice, but it's not
really OVS development--the only code you'd need in OVS is code to
configure the kernel support for whatever queuing discipline you build.