[ofa-general] [RFC] [PATCH 0/3] 2.6.22 or 23 ib: add path record cache

[Devesh Sharma]

Hello Sean, Thanks for replying.
Still I am not able to get it completely, I have seen through the SA
code please help me out in understanding SA design as a whole, my
query is as follows

If some client calls cma_resolve_ib_route(), and let's assume that its
local cache miss, and cma_query_ib_route() is called, this will send a
SA query to the SM node CMIIW, Now on SM node I am not able to figure
out that who will respond this GMP, and how requested attribute info
is collected?

On 4/20/07, Sean Hefty <mshefty at ichips.intel.com> wrote:
> > Once SM is up on a node/switch whole network is up. Now is if some
> > client is trying to establish a connection with other node, client is
> > expected to resolve the path using sa API, I want to know how exactly
> > it happens in the stack?
>
> See patch 3/3 for the use of the cache.  In that patch, the rdma_cm first checks
> to see if a suitable path record is available in the cache.  If one is not
> found, it issues a query to the SA.  The stack impact of using the cache is less
> than the impact of sending a path record query to the SA.
>
> > Is it  possible to program local_sa_cache with some dummy path records
> > which resides in cache for long time?
>
> This would require changes to the current implementation.
what about this :
One user command, reading path record from some file and passing this
to local_sa_cache module using sysfs/ioctl, local_cache module is
assuming it as a incoming path_record query and adding it to the
cache. possibly some device interface is required to be added to the
module if ioctl is used

-Devesh
>
> - Sean
>