Gunnar von Boehn writes: > Interesting points. > Can you help me to understand where the negative effect of DCBZ does come > from?
In my experience, dcbz slows down the hot-cache case because it adds a few cycles to the execution time of the inner loop, and on most 64-bit PowerPC implementations, it doesn't actually help even in the cold-cache case because the store queue does enough write combining that the cache doesn't end up reading the line from memory. I don't know whether the Cell PPE can do that, but I could believe that it can't. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
