[PATCH 3/3] exa/mixed: Exclude frontbuffer from deferred pixmap handling.
madman2003 at gmail.com
Mon Dec 20 06:54:36 PST 2010
2010/12/20 Michel Dänzer <michel at daenzer.net>:
> On Mon, 2010-12-20 at 15:46 +0100, Maarten Maathuis wrote:
>> 2010/12/14 Michel Dänzer <michel at daenzer.net>:
>> > On Mon, 2010-12-13 at 19:42 +0100, Maarten Maathuis wrote:
>> >> - Apps like xterm can trigger a lot of fallback rendering.
>> >> - This can lead to (annoyingly) high latencies, because you
>> >> have to wait for the block handler.
>> >> - You need a driver that doesn't directly access the front
>> >> buffer to trigger this (NV50+ nouveau for example).
>> >> - Repeatingly doing dmesg on an xterm with a bitmap font
>> >> will reveal that you never see part of the text.
>> >> - I have recieved at least one complaint in the past of slow
>> >> terminal performance, which was related to core font
>> >> rendering.
>> >> - This does sacrifice some throughput, not sure how much,
>> > Shouldn't be hard to measure.
>> I did a little test (catting a saved copy of dmesg) and the throughput
>> loss is about 25%.
> What are the absolute numbers?
Roughly 250 ms vs 330 ms (error margin is about 20-30 ms if i had to guess).
> Earthling Michel Dänzer | http://www.vmware.com
> Libre software enthusiast | Debian, X and DRI developer
Far away from the primal instinct, the song seems to fade away, the
river get wider between your thoughts and the things we do and say.
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