[openib-general] Re: [PATCH 0/4] SA path record caching

[Sean Hefty]

Michael S. Tsirkin wrote:
> When is the cache invalidated?

The cache is updated every 15 minutes, but this value is user configurable at 
module load time.  The cache is also updated if a local event occurs, such as 
port up/down or SM LID change.

> In the presence of failures in the network,
> an attempt to create a connection with a cached path might fail.

The same is also true for paths returned directly from the SA, and detection of 
the failure could depend on how often the SM sweeps the fabric.  At some point, 
the cache will contain multiple paths, letting the connection be retried along 
another path.

- Sean