On 12/13/2011 05:40 PM, Konrad Rzeszutek Wilk wrote:
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.
Konrad, Jerome
Was there a resolution to this. If the ttm_tt rewrite results in
unpopulate being called more often than before,
and that causes performance regressions, that must be fixed as soon as
possible.
/Thomas
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