Scott Wood writes: > I'm not sure why we don't use dcbt in memcpy(), as it's just ignored if > the memory is cache-inhibited.
Both dcbt and dcbz tend to slow things down if the relevant block is already in the cache. Since the kernel memcpy is mostly used for copies that are only 1 or a small number of cache lines long, it's not clear that the benefit of dcbt and/or dcbz would outweigh the cost. And anyway, I have yet to be convinced that optimizing memcpy would provide a measureable benefit. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
