On Wed, Mar 27, 2013 at 6:06 AM, Atam <ata...@gmail.com> wrote:
> Hi all,
>
> OVS is a software solution switch as i understand.  It is able to utilize
> offloading features of the Ethernet adapter I read somewhere...
>
> - What features are those? Is it desirable to invest in 10GB adapters with
> full TCP chimney support like Emulex (OCe11102) or Broadcom (57810S) ? Or is
> Intel intelligent offloading the same for OVS?
> - Is OVS using virtual function available on the adapter (now or in the
> future)?
>   e.g. Intel x540 adaters support 64 VF's per port. Around the same for
> Emulex and Broadcom.
>  But Solarflare (SFN5121T) supports 254 VF's. Will that have an effect on
> OVM?

OVS does not use any of these.  Most of them have implications for the
entire stack, so if you are using them currently (I suspect you are
not) you need to evaluate your requirements.

> - For best performance and  minimal CPU overhead is there something else
> (not mentioned above)  I should look into when comparing 10GB nics?

The actual implementation of the NIC, stateless offloads, driver
quality, etc. will all have an impact on performance.  You should
evaluate different cards with your workload

> - If i use OVS on a compute node with KVM as hypervisor, what will decide
> the maximum number of virtual nic's supported?
>   e.g. My goal is to have max 100 vps with each max 4 vnics = max 400 vnics
> on 1 10GB port/adapter... which is why i want the best adapter for this
> purpose...with maximum offloading of OVS.

This is affected by many factors and not significantly by OVS.
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