<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - powerpc64 & 64Kb kernel pagesize not working with nouveau" href="https://bugs.freedesktop.org/show_bug.cgi?id=94757#c3">Comment # 3</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - powerpc64 & 64Kb kernel pagesize not working with nouveau" href="https://bugs.freedesktop.org/show_bug.cgi?id=94757">bug 94757</a> from <a class="email" href="mailto:imirkin@alum.mit.edu" title="Ilia Mirkin <imirkin@alum.mit.edu>"> Ilia Mirkin</a> <pre>Unfortunately it's not just a switch to flip on. A lot of the current code is very confused about cpu pages vs gpu pages (which are always 4K). Also one would need a bunch of handling code to deal with sub-cpu-page-sized allocations on the GPU (or conversely just disallow those entirely). Nouveau is known to not work properly on non-4K-cpu-page-size, at least with some GPUs (maybe even all). AFAIK the benefits of using 64K-pages are virtually non-existent outside the HPC space (each cached 1 byte file takes up 64K of memory, so it goes a lot faster). But that's certainly not an argument for not supporting 64K pages in nouveau. The argument for not supporting 64K pages is -ENOPATCH :) AFAIK benh tried for a while and failed. This was ~2y ago.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>