windows smoke test failing on dbw render-blocking-resources

[paulirish]

It's been flaking/failing for a week or two.

[paulirish]

Debugging this a bit between a passing run and a failing windows run.

I added some console logs to debug.

// passing
{
  estimateBeforeInline: 2319.4099999999994,
  estimateAfterInline: 1381.5499999999997,
  wastedMs: 938
}
// failing
 {
  estimateBeforeInline: 1076.71,
  estimateAfterInline: 1076.71,
  wastedMs: 0
 }

and what i'm seeing in the adjustedNodeTimings..

in the passing one:

• document's duration is 756ms
• the 3 cpu nodes have durations of 19-30ms
• the remaining network nodes all have durations of 156ms.

in the failing one

• document's duration is 752ms
• the 3 cpu nodes have durations of 22-48ms
• the remaining network nodes all have durations of 302ms.

diff for googlers: https://diff.googleplex.com/#key=u3j5ULSUx10p

so far that much doesnt mean much to me.. but making a record for now…

[patrickhulce]

this seems like a graph problem. we must be missing some information in the failing case that prevents it from being marked as necessary for FCP