[PATCH 3/3] exa/mixed: Exclude frontbuffer from deferred pixmap handling.
michel at daenzer.net
Tue Dec 14 01:02:04 PST 2010
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
> - This does sacrifice some throughput, not sure how much,
Shouldn't be hard to measure.
> but users tend to respond poorly to unexpected latency IMO.
I'm sure some do, but I also suspect some do to unexpected slowness. :}
Earthling Michel Dänzer | http://www.vmware.com
Libre software enthusiast | Debian, X and DRI developer
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