On Mon, Feb 18, 2008 at 07:32:49PM +0000, Thiemo Seufer wrote: > Fold the SB-1 specific implementation of clear_page/copy_page in the > generic version, and rewrite that one in tlbex style. The immediate > benefits: > - It converts the compile-time workaround for SB-1 pass 1 prefetches > to a more efficient run-time check. > - It allows adjustment of loop unfolling, which helps to reduce the > number of redundant cdex cache ops. > - It fixes some esoteric cornercases (the cache line length calculations > can go wrong, and support for 64k pages without prefetch instructions > will overflow the addiu immediate). > - Somewhat better guesses of "good" prefetch values. > > > Signed-off-by: Thiemo Seufer <ths@xxxxxxxxxxxx> > --- > > Lmbench3 running on a BCM1480 system shows improvements for some > benchmarks (three runs with the original kernel, then three runs > with the patched kernel), most markedly (~5%) for open/close and > exec: The patch is certainly a good thing but I somehow doubt for many of the improvments that they are a result of the patch and not the unavoidable benchmarking noise. Queued for 2.6.26, Ralf
