[ofa-general] [PATCH RFCv2 1/2] RDMA: Add protocol statistics attributes to the RDMA sysfs.

[Caitlin Bestler]

On Thu, Jun 19, 2008 at 8:16 AM, Roland Dreier <rdreier at cisco.com> wrote:
>  > The "Retransmission count" is per netdev and we support multiple netdev
>  > per physical port.  We have designed our silicon to support stats at
>  > netdev level and it doesn't make sense for us to aggregate stats from
>  > all netdevs and report at a device level.  Perhaps we can compromise,
>  > Chelsio can give device level stats at /sys/class/infiniband/$device and
>  > for NetEffect, we can provide netdev level stats below it?
>
> Hmm, kind of a mess if we can't achieve some uniformity...
>

There's an even tougher potential issue on the "uniformity" issue than
whether statistics are talled per port or per device -- and that is whether
they are gathered separately for offload services and the default stack
or not.

I can envision designs where the statistics for the offload services
would have to be gathered separately, and those where they would
have to be gathered for all the traffic (no matter which L4/L5 service
was being used).

One way to deal with that might be to define the "iwarp statistics"
as being those for the interface that were *not* reported to the
general purpose stack. Or it might be a flag indicating whether
the two sets of statistics were intermingled or  not.