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

[Devesh Sharma]

Hello sean I have certain queries about local_sa_cache.

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?

second query is below.

On 4/20/07, Sean Hefty <sean.hefty at intel.com> wrote:
> The following set of patches adds a local SA path record cache to the IB stack
> (currently based on 2.6.20-rc4).  The cache is derived from the OFED 1.2 local
> SA cache patches, with changes based on the last round of feedback and current
> Path Forward feature requests:
>
> * InformInfo/Notice support added to ib_sa
> Clients may now register to receive SA related events.  The local_sa uses this
> to receive notification of GID up/down events in order to keep the cache up to
> date.
>
Is it  possible to program local_sa_cache with some dummy path records
which resides in cache for long time?
> * Removal of time based cache updates
> Cache updates are now driven by local and SA events.  Most module parameters
> have been eliminated, and remaining options are exposed through a file system
> interface for dynamic control, including the ability to force a cache refresh.
>
> Using a local SA cache we were able to establish all-to-all connections between
> 1024 processes (about 1 million connections) in about 3 seconds.  Without the
> cache, connection time took about a minute, and required a substantial amount of
> tuning of timeout values to achieve this.
>
> I've only updated the rdma_cm to use the cache, but similar changes could be
> made to SRP and ipoib (which implements its own path record cache).
>
> I would like to get feedback on both the notice and local_sa patches for
> inclusion in 2.6.22 or 2.6.23 (if 2.6.22 is not possible).
>
> Signed-off-by: Sean Hefty <sean.hefty at intel.com>
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