linux-kernel - Re: TTM page pool allocator

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Message-ID: <alpine.DEB.2.00.0906260836280.26643@skynet.skynet.ie>
Date:	Fri, 26 Jun 2009 08:38:36 +0100 (IST)
From:	Dave Airlie <airlied@...ux.ie>
To:	Jerome Glisse <glisse@...edesktop.org>
cc:	Dave Airlie <airlied@...il.com>, linux-kernel@...r.kernel.org,
	dri-devel@...ts.sf.net
Subject: Re: TTM page pool allocator

> 
> 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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