[openib-general] Re: InfiniBand MAD device number request

[Torben Mathiasen]

On Sat, Jan 08 2005, Roland Dreier wrote:
>     Torben> How many minors do you guys need? char majors are very
>     Torben> scarce, so if you know how many you need, we can make the
>     Torben> best possible assignment.
> 
> One minor is consumed for each port of each InfiniBand HCA installed
> in the system.  I know of real systems that have 10 two-port HCAs
> installed, which would require 20 minors.  32 minors may be too few,
> since it would not allow for a doubling of already-existing
> installations, although perhaps larger systems could be forced to use
> dynamic major allocation.
> 
> So depending on how constrained your allocation space is, I would
> prefer 64 minors but 32 is probably OK.
>

Allright, I begun looking into using the 2.6 specific major/minor allocations.
2.6 allows 20 bit worth of minors per major. I'll let you know once I know
more.

In the mean time, you can just use some of the local/experimental ones which
you probaly already do.

Thanks,
Torben