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From: | Dmitry Gutov |
Subject: | bug#28695: 26.0.60; Rendering lag spikes caused by double-buffering on Linux |
Date: | Mon, 9 Oct 2017 16:53:18 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:56.0) Gecko/20100101 Thunderbird/56.0 |
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 (or even without, if you're willing to wait).
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.
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