<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB, BXT] up to 40% perf drop from "loader/dri3: Overhaul dri3_update_num_back" commit" href="https://bugs.freedesktop.org/show_bug.cgi?id=97549#c5">Comment # 5</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [SNB, BXT] up to 40% perf drop from "loader/dri3: Overhaul dri3_update_num_back" commit" href="https://bugs.freedesktop.org/show_bug.cgi?id=97549">bug 97549</a> from <a class="email" href="mailto:eero.t.tamminen@intel.com" title="Eero Tamminen <eero.t.tamminen@intel.com>"> Eero Tamminen</a> <pre>(In reply to Michel Dänzer from <a href="show_bug.cgi?id=97549#c4">comment #4</a>) > Created <a href="attachment.cgi?id=126214" name="attach_126214" title="Always use at least two buffers">attachment 126214</a> <a href="attachment.cgi?id=126214&action=edit" title="Always use at least two buffers">[details]</a> <a href='page.cgi?id=splinter.html&bug=97549&attachment=126214'>[review]</a> [review] > Always use at least two buffers > > Does this patch fix the problem? Yes, but that's not all... BXT performance raised a lot in the affected programs end of last week (some more than the drop, some less than the drop). This was due Chris' commit adding BXT & KBL PCI IDs to xf86-video-intel. I assume with this, X will be using SNA also on BXT instead of the "default acceleration" that uses (slow) legacy blitter. So, I did few tests: * BXT: reverting the "Overhaul dri3_update_num_back" with the new X DDX didn't affect the performance (same good one) * BXT: with old X DDX attached patch fixes the drops * BXT: with new X DDX attached patch doesn't give additional improvement * SNB: attached patch fixes the drops Comments: - This isn't necessarily Mesa issue, but X DDX one - Something fishy with SNB for which it would be good to get comment from Chris Still TODO: -Check modesetting driver perf with the before and after the commit - Provide requested info from GDB</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>