Re: TTM page pool allocator

[Dave Airlie]

> 
> I think it's better to fix userspace to not allocate as much buffer per
> frame as it does now rather than having a pool of wb pages, i removed
> it because on my 64M box memory is getting tight, we need to compute
> the number of page we still based on memory. Also i think it's ok
> to assume that page allocation is fast enough.

Yup we could try decreasing the DMA buffer size, I think the DMA buffer 
would be a lot better suited to suballocation, doing individual bo allocs 
like the code used to was a major hit, assuming page alloc is fast enough 
isn't valid since I've already proved it was a major CPU user when I fixed 
it the first time :)

The problem with making the dma buffer smaller is the having a buffer 
mapped and sent to the kernel for relocs.

Dave.
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