Hi,
On 07/20/2016 01:04 AM, Carsten Haitzler (The Rasterman) wrote:
With this I managed to get a desktop and was unable to start
wayland-terminal. Redrawing of the graphics felt fairly snappy, but the
lag from pressing a key on the keyboard until a character showed up in
the terminal was slow, probably between a quarter to half a second.
So my question is if this is the performance I should expect with weston
on a 400MHz ARM9 and a dumb framebuffer? Have I done something stupid
and there are easy ways to speed it up?
when you say redraw is snappy... that implies that output is fast. so time from
deciding to render and update and it appearing is very short. but you seem to
have serious input lag which implies to me that it has nothing to do with your
cpu speed and is something else deeper and more involved. time to trace things
and see how they go.
I put up a short video here:
http://zoo.weinigel.se/misc/2016-07-20-213549.webm
On the framebuffer I don't perceive any lag at all between a keypress
and the character appearing on the screen.
With weston-terminal running I can drag the window around and even
though it's not very fast and there's a bit of tearing it isn't too bad.
The response when dragging feels ok. Keypresses feel laggy even though
mouse motion doesn't, but I'm not sure if that's because I don't notice
the lag when moving the mouse or if it is a real difference.
I tried to do a strace of weston-terminal, but it was a bit painful, it
reads every file it can find in /usr/share/icons/default/cursors/ when
it starts so strace took forever before the terminal would even show up.
And for trying to do more advanced tracing, I don't quite know where to
start. Are there any knobs in the source to do things such as dump
timestamps for messages between the server and client?
/Christer
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