On Mon, 2009-08-10 at 15:26 -0500, Scott Wood wrote: > Kenneth Johansson wrote: > >>> should not the framebuffer be marked as cache write through. that is the > >>> W bit should be set in the tlb mapping. Why is this not done ? is that > >>> feature also not working on 5121 ?? > >> It probably would have been too slow. > > > > how much slower would write through be ? I thought it was not that big > > of a difference from copy back. > > It's a big difference if you're writing out an entire cache line of data > anyway, but because of write-through it goes out one word at a time > without bursting. > > -Scott > Yes the memory system would obviously get a higher load but do the CPU actually see that? do it stall on the write ?
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