Dave Airlie wrote: > On Wed, 28 Jan 2009, Shunichi Fuji wrote: > > >> oh I filled bugzilla.kernel.org right now ... >> >> On Wed, 28 Jan 2009 09:31:32 +0000 (GMT) >> Dave Airlie <airl...@linux.ie> wrote: >> >>> Does the attached patch help? >>> >> I also think so once, >> but it will be bad with cant_use_aperture AGP. >> my patch attached to bugzilla. >> > > Good point, the attached fixes that. > > >> BTW using Write-Combining for ring-buffer is safe? >> I afraid a bit that miss ordered. >> > > Yes it should be fine, write combining shouldn't re-order, > and its been write combined using an mtrr for years. > > Dave > > Actually, I think it may re-order, so WC buffers need to be flushed with an mb() before updating registers or pointers that depend on data being present in memory.
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