Input latency

[Christopher James Halse Rogers]

On Fri, 2013-12-13 at 17:31 +0800, Daniel van Vugt wrote:
> Here are some fun numbers I've collected about the latency between input 
> events sent from the top-level Mir server to a client. All in 
> milliseconds...
> 
> Desktop (3.12.0-7-generic)
> Direct 0.8ms
> Nested 1.3ms
> 
> Desktop (3.11.0-11-lowlatency)
> Direct 1.0ms
> Nested 1.7ms
> 
> Nexus4 (3.4.0-3-mako)
> Direct 0.9ms
> Nested 1.5ms with high variance; frequent spikes to 73ms. Sometimes 700ms.

Do we have any way to get insight into the spikes? Something strange is
obviously happening when the variance is ~3 orders of magnitude.
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