Ingo Molnar wrote:
* Bill Davidsen <[email protected]> wrote:
There is another way to show the problem visually under X
(vesa-driver), by starting 3 gears simultaneously, which after
laying them out side-by-side need some settling time before
smoothing out. Without __update_curr it's absolutely smooth from
the start.
I posted a LOT of stuff using the glitch1 script, and finally found a
set of tuning values which make the test script run smooth. See back
posts, I don't have them here.
but you have real 3D hw and DRI enabled, correct? In that case X uses up
almost no CPU time and glxgears makes most of the processing. That is
quite different from the above software-rendering case, where X spends
most of the CPU time.
No, my test machine for that is a compile server, and uses the built-in
motherboard graphics which are very limited. This is not in any sense a
graphics powerhouse, it is used to build custom kernels and
applications, and for testing of kvm and xen, and I grabbed it because
it had the only Core2 CPU I could reboot to try new kernel versions and
"from cold boot" testing, discovered the graphics smoothness issue by
having several windows open on compiles, and developed the glitch1
script as a way to reproduce it.
The settings I used, features=14, granularity=500000, work to improve
smoothness on other machines for other uses, but they do seem to impact
performance for compiles, video processing, etc, so they are not optimal
for general use. I regard the existence of these tuning knobs as one of
the real strengths of CFS, when you change the tuning it has a visible
effect.
--
bill davidsen <[email protected]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
