On 01/08/2014 06:10 PM, Chris Wilson wrote:
On Wed, Jan 08, 2014 at 04:57:52PM +0100, Thomas Richter wrote:
Hi folks,
during the changes from 3.12rc7 to 3.13rc4, the performance of
XDrawRectangles() dropped considerably. Interestingly, it is not the
raw rectangles drawing operations that are slow, but it seems that
the "per-call" overhead has increased by one magnitude. In specific,
if you use the unmodified "x11pref" program:
Just to be clear: new = 3.13-rc4, old = 3.12-rc7 ?
Yes, exactly.
I've taken a quick look at this on an ivb i7-3270qm, and see a 296kops/s
to 248kops/s decrease. Not massive, and considering the difference in
our hardware probably a distinct issue.
Well, note that a 1Ghz P-III / i830M is not an i7-3270qm. (-;
Did you made the changes in x11perf as I did? The bottleneck is not in
the actual rectangle rendering, it is somewhere in the call-path from
the application down to the hardware, i.e. the per-call overhead
increased by a factor of eight.
Kernel configuration is identical, as much as I could arrange it. X11
and higher level libraries are all identical, I only changed the kernel.
Greetings,
Thomas
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