On Tue, Dec 13, 2011 at 05:23:30PM +0100, Thomas Hellstrom wrote: > On 12/13/2011 05:07 PM, Jerome Glisse wrote: > >On Mon, Dec 12, 2011 at 03:09:26PM -0500, Konrad Rzeszutek Wilk wrote: > >>Jerome pointed me to some accounting error in the DMA API debugging code and > >>while I can't figure it out yet, I did notice some extreme slowness - which > >>is due to the nouveau driver calling the unpopulate (now that unbind + > >>unpopulate are squashed) quite a lot (this is using Gnome Shell - I think GNOME2 > >>did not have those issues but I can't recall). > >> > >>Anyhow these patches fix the 50% perf regression I saw and also some minor bugs > >>that I noticed. > >> > >Gonna review those today and test them. > > > >Cheers, > >Jerome > Hi! > > I'm not whether any drivers are still using the AGP backend? Uh, probably they do if the cards are AGP? The problem I encountered was with an PCIe Nvidia card: 01:00.0 VGA compatible controller: nVidia Corporation G84 [GeForce 8600 GT] (rev a1 > Calling unpopulate / (previous clear) each time unbind is done > should be quite > inefficient with that one, as AGP sets up its own data structures > and copies page tables > on each populate. That should really be avoided unless there is a > good reason to have it. nouveau_bo_rd32 and nv50_crtc_cursor_set showed up as the callers that were causing the unpopulate calls. It did happen _a lot_ when I moved the cursor madly. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
