On Wed, 30 Nov 2011 15:47:14 -0600 DRC <dcomman...@users.sourceforge.net> wrote:
>
> Yes, I'm getting the "enabling continuous updates" message. How I'm
> testing is to look at responsiveness when running 'vglrun glxspheres -i
> -fs' with quality=1 and compress level=1. I move the mouse across the
> screen and gauge (with a stopwatch) how long it takes for the server to
> "catch up." It's consistently about 1.5 seconds both before and after
> the high-latency modifications. TurboVNC performs similarly with
> similar quality/compress level ("Low-Quality JPEG preset.")
>
Not sure I'm understanding your test case. The mouse is normally
rendered locally and not latency sensitive. Or are you disabling that
for the test?
> GLXspheres at this quality level is going to cause Tiger/TurboVNC to
> generate about 0.5 Mbits/frame of data at 1240x900, so if the frame rate
> is not latency-limited, TigerVNC should be capable of at least 5-6 Hz
> given the effective bandwidth of the 10 Mbit connection. However, it
> seems to be still generating about 3 Hz, the same as it did before the
> modifications.
Odd. There is a corner case where single updates exceed the congestion
window, but that shouldn't happen here. For 10 Mbit at 100 ms RTT, it
should have a window of at least 1 Mbit, meaning it should fit two or
three of those updates in there per round trip.
Can you try with the congestion debugging turned on and see what
latency and congestion window it gets?
> I also do not notice any difference when typing into a console window,
> moving windows around, etc. Further, it appears that double buffering
> is not working quite right, but that's the case in the pre-modified
> build as well.
In what way? At such low frame rates, perhaps you're hitting the timer
which prematurely updates the screen so it won't appear frozen.
Rgds
--
Pierre Ossman OpenSource-based Thin Client Technology
System Developer Telephone: +46-13-21 46 00
Cendio AB Web: http://www.cendio.com
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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