Re: [RFC 0/8] Reliably generate large request from SRP

Roland Dreier
2011-01-19T05:31:13Z

Hi Dave,

> Now that at least one vendor is implementing full support for the SRP
> indirect memory descriptor tables, we can safely expand the sg_tablesize,
> and realize some performance gains, in many cases quite large. I don't
> have vendor code that implements the full support needed for safety, but
> the rareness of FMR mapping failures allows the mapping code to function,
> at a risk, with existing targets.

Have you considered using memory registration through a send queue (from
the base memory management extensions)? mlx4 at least has support for
this operation, which would let you pre-allocate everything and avoid
the possibility of failure (I think).

When do we get FMR mapping failures now?

- R.