On 7/11/07, Stephen Warren <[EMAIL PROTECTED]> wrote:
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Timothy Normand Miller wrote:
> Note: We looked at it with a PCI bus analyzer, and what we see is
> that the x.org code results in long bursts, while ours results in
> individual transactions, which would explain why we're so slow. What
> could x.org code be doing that would result in bursts, while ours
> doesn't?
Probably, the dcache generates bursts during write-back/flush and CPU
generates single-beat accesses when writing to uncached areas (or
write-through cache?)
Is there something you can do when mapping memory that will set
whether it's cached or not? We're just doing a simple mmap in our
test software, while we're using some xf86 function in the X server.
--
Timothy Normand Miller
http://www.cse.ohio-state.edu/~millerti
Open Graphics Project
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