On 6/9/05, kas <kas11@xxxxxxxxxxxxxxx> wrote: > Of course, on through -m64 was as expected. I'm just a bit surprised > that it didn't say mtune=k8 since it was definitely building on one ... > which begs the question ... is GCC (and hence the entire x86_64 > distribution) being built this way? What are the K8 performance > implications? I've seen a few things that indicate that Nocona cores > running K8 code look pretty bad in some areas compared to optimized > code...however, I find nothing to indicate how nocona optimized code > runs on the K8. Well... if you really want to find out for yourself you could run benchs. I'm pretty confident that the distro-wide settings are close to the best if not the best settings to provide the best average performance for people using the variety of x86_64 chips in the wild. I highly doubt Core is ever going to decide its worth the support and maintainence hassle to distro tuned optimally for just a 64bit amd chip or just a 64bit intel chip. When you are only going to ship one version of the distro to cover several chips.. you make choices as to what performance hits your are going to allow. I'm very confident that the choices made for Core allow both intel and amd hardware users to have reasonable good performance from the same binaries. -jef -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/fedora-devel-list
