Just to add some more comment on MAX_FLUSH_VERTICES  - when set to valu
96 - it gives the highest throughput on  x11perf -aa10text 3.7MChar/s  -
using any higher value doesn't make any different (so the max seems to
be somewhere  between <64-96]

Also when this 3.7MChar is rendered - the parallel move of some other
window on the screen becomes very slow - so engine gets overloaded ??

Or the Xserver generates such long queue of events it becomes so slow ?

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https://bugs.launchpad.net/bugs/1098489

Title:
  [gen4] Corruption in Chrome omni bar results using Intel SNA

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