Re: InfiniBand Implementations

"Nick Maclaren" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
>
> Well, as I asked about HyperTransport, I shall ask about InfiniBand
:-)
>
> As previous threads demonstrated, the InfiniBand specification
attempts
> to be all things to all me, but it was and is very clear that the way
> it is going to be used is that implementors of devices, software and
> perhaps even interfaces will make assumptions about which subsets they
> are going to use and optimise or even support accordingly.  Just as
> happened with SCSI.
>
> My specific question is about the software designs, and the way that
> the hardware interfaces intend that the software should use them.  In
> particular, that dreaded question of user-space DMA, with its related
> issues of whether the user can provide arbitrary locations for DMA
> use, the scope of pinning of such locations, what support there is for
> memory migration or swapping and so on.
>
> Has anyone started to document any of that yet?  Because it is
obviously
> a prerequisite for writing (or even designing) efficient and robust
> code to use InfiniBand.
>
>
> Regards,
> Nick Maclaren.

Has the Linux code for the existing (plug into PCI) HCA cards been made
public?  Perhaps that would answer your question, or is there something
about PCI that would cloud the issue?

del