[ofa-general] Re: [RFC] [PATCH 0/3] 2.6.22 or 23 ib: addpathrecord cache

[Sean Hefty]

>Maybe, but there might be several other reasons for this.
>
>One might be that IPoIB is slower than link speeds,
>so e.g. miscalculating the rate still does not cause network failures.
>Another might be that people run TCP mostly, which
>is very good at recovering from failures, so if you get the LID
>right, the rest of the values being off might not matter.
>
>In short, I'm not sure the fact that IPoIB works
>means we can copy it's caching over safely.

I'm starting to get lost here.  Are you concerned that the SM will change the
MTU or rate of a path, and the caches will not be updated?  What about existing
connections?

I see that either the SA can use events to notify end nodes when such a
situation arises, or the end nodes can poll for changes.  The former isn't
spec'ed, but the later can be done using the ib_local_sa's /sys/class interface.

- Sean