[ofa-general] Re: [PATCH 0/4] opensm: more routing optimizations

[Hal Rosenstock]

On Thu, 2007-03-08 at 08:45, Sasha Khapyorsky wrote:
> Mostly it implements the "switch only" optimization idea and affects
> the min hops matrices building phase (for both up/down and default
> builders).
> 
> The main trick is to keep the min hop tables _ONLY_ for switches base
> LIDs and don't bother with CAs, routers LIDs and any secondary LIDs in
> case when LMC > 0 - this saves a lot of memory and cpu cycles needed
> for calculation and storing the huge whole fabric matrices.
> 
> For CA and router ports we will refer its neighbor switch's min hop
> vectors. And for LMC > 0 case we will use base LID's min hop vectors
> for any secondary LIDs (for CAs and routers it will neighbor switch's
> base LID).
> 
> Preliminary testing shows 3-4x speedup in the min-hop generation phase
> and yet another 2x for up/down.

More nice work! Thanks, Sasha.

-- Hal

> Sasha