[ofa-general] Re: IPoIB path caching

[Michael S. Tsirkin]

> Quoting Sean Hefty <mshefty at ichips.intel.com>:
> Subject: Re: [ofa-general] Re: IPoIB path caching
> 
> Michael S. Tsirkin wrote:
> >>I believe a better solution is for everyone to use cached records, if 
> >>they exist, with a feedback mechanism from the CM that removes paths on 
> >>a connection failure or path migration event.
> >
> >Ack timeout on an RC QP is also a good indication we should redo the 
> >lookup.
> 
> Do you know if we get a specific event for this?  (I don't remember.) 

CQE with error IIRC.

> Both the ib_cm and rdma_cm have interfaces that allow a user to report 
> events on a connection.  They are used for path migration today, but we 
> could easily extend them.

Makes sense.

> To minimize issues, I think we'll want some sort of feedback mechanism 
> in place before enabling caching by default.

Right.

-- 
MST