From: Jerome G. <gl...@fr...> - 2009-06-26 14:09:47
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On Fri, 2009-06-26 at 10:00 +1000, Dave Airlie wrote: > On Thu, Jun 25, 2009 at 10:01 PM, Jerome Glisse<gl...@fr...> wrote: > > Hi, > > > > Thomas i attach a reworked page pool allocator based on Dave works, > > this one should be ok with ttm cache status tracking. It definitely > > helps on AGP system, now the bottleneck is in mesa vertex's dma > > allocation. > > > > My original version kept a list of wb pages as well, this proved to be > quite a useful > optimisation on my test systems when I implemented it, without it I > was spending ~20% > of my CPU in getting free pages, granted I always used WB pages on > PCIE/IGP systems. > > Another optimisation I made at the time was around the populate call, > (not sure if this > is what still happens): > > Allocate a 64K local BO for DMA object. > Write into the first 5 pages from userspace - get WB pages. > Bind to GART, swap those 5 pages to WC + flush. > Then populate the rest with WC pages from the list. > > Granted I think allocating WC in the first place from the pool might > work just as well since most of the DMA buffers are write only. > > Dave. > -- Attached a new version of the patch, which integrate changes discussed. Cheers, Jerome |