[Bug 97035] [SKL/BSW/BDW]WebGL rendering delayed too much on nop particles and renders with 0-1FPS

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97035

            Bug ID: 97035
           Summary: [SKL/BSW/BDW]WebGL rendering delayed too much on nop
                    particles and renders with 0-1FPS
           Product: Mesa
           Version: unspecified
          Hardware: IA64 (Itanium)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: nataraj.deshpande at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Created attachment 125249
  --> https://bugs.freedesktop.org/attachment.cgi?id=125249&action=edit
ui logs collected from chromebook with --disable-gpu-watchdog

Steps to Reproduce
===============
go to http://www.iamnop.com/particles/ in chrome browser

Expected Result
=============
website should load within 10 seconds with good performance (~30FPS)

Actual Result
==============
Website renders with 0-1FPS. On Skylake/Broadwell it takes ~40 seconds to start
rendering. On Brasswell it takes over 2 mins to start rendering.

This looks like performance regression in mesa in later versions(12.0 etc). 
With mesa 11.30.0 issue is not seen on skylake/broadwell while performance is
little better on braswell(cyan) taking ~20 seconds. 
With mesa ToT issue is always seen.

Tried on above platforms on chromebooks with chromeos and arch linux.
Chrome trace indicate
BDW with mesa 12.1.0: DoLinkProgram(load stage) wall duration=33.8 seconds
BDW with mesa 11.30: DoLinkProgram(load stage) wall duration=6.8 seconds (Good
working)

Backporting to mesa 11.3 version on the same target device issue is not seen on
big core.

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