[ofa-general] Re: [PATCH v2] IB/ipoib: use vmap with allocation of tx ring

[Or Gerlitz]

Roland Dreier wrote:
> If you're going to use vmap(), then you might as well use vmalloc().

I might mislead Eli here, sorry for that.

> the issue is with consuming address space, which is very limited on
> 32-bit systems (there is often less than 128 MB of vmalloc available
> total).  However in this case it is probably OK.  I guess we don't
> want to allocate these structures independently and take another
> pointer deref for every send -- although I would be curious to know if
> it actually costs much.

So what's your suggestion? maybe we go with vmalloc on 64-bit systems 
and on 32-bits system limit the user to what kmalloc can provide (which 
is about ~850 size rings with the tx_buf consuming 8*18 u64's + pointer.

Or