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bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on L
From: |
Eli Zaretskii |
Subject: |
bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux |
Date: |
Mon, 09 Oct 2017 17:03:37 +0300 |
> Cc: npostavs@users.sourceforge.net, bryan@bryan.sh, 28695@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Mon, 9 Oct 2017 16:53:18 +0300
>
> On 10/7/17 11:14 AM, Eli Zaretskii wrote:
>
> > Can some of you use a tool like perf to see whether the time taken by
> > XdbeSwapBuffers (called from xterm.c:show_back_buffer) indeed grows
> > significantly when going from the 2K class of resolutions to the 4K
> > class? And if it isn't XdbeSwapBuffers, then what takes most of the
> > time which causes that "stutter"?
>
> With some pointers on how to use perf, I'd be happy to do that
I think this page (which you probably already know about) is a good
starting point:
http://www.brendangregg.com/perf.html
> (or even without, if you're willing to wait).
There's no rush, so please take your time.
> But I'm not seeing a qualitative difference between a 4K fullscreen
> Emacs, a half-screen Emacs, or even Emacs with window resized further
> down: there are still minor stutters here. So I'm probably not the best
> person for this experiment.
Well, you saw a difference between a 4K display and a 2K display,
didn't you? All we need is to compare 2 situations and see where's
the extra time spent.
Maybe Bryan could also try the profile, as he reported a significant
difference.
Thanks.
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, (continued)
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Dmitry Gutov, 2017/10/05
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Eli Zaretskii, 2017/10/05
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Noam Postavsky, 2017/10/05
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Dmitry Gutov, 2017/10/07
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Eli Zaretskii, 2017/10/07
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Dmitry Gutov, 2017/10/09
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux,
Eli Zaretskii <=
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Dmitry Gutov, 2017/10/15
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Eli Zaretskii, 2017/10/15
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Dmitry Gutov, 2017/10/26
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Eli Zaretskii, 2017/10/28
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on GNU/Linux, Richard Stallman, 2017/10/28
- bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux, Bryan Gilbert, 2017/10/05