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Issue 648341 link

Starred by 1 user
Status: Fixed
Owner:
█ bmcquade@chromium.org
Last visit > 30 days ago
Closed: Sep 2016
Cc:
csharrison@chromium.org
EstimatedDays: ----
NextAction: ----
OS: ----
Pri: 3
Type: Bug



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Address large number of ERR_IPC_WITH_NO_RELEVANT_LOADs

Project Member Reported by bmcquade@chromium.org, Sep 19 2016 
We see a large number of ERR_IPC_WITH_NO_RELEVANT_LOADs. It appears these may be due to prerender, at least in part, as we don't create a PageLoadTracker for prerenders but the render process will send metrics.

Since we intend to track prerenders, the simplest fix for now is to create a PageLoadTracker but immediately stop tracking metrics on it. Eventually, we can update this logic to enable tracking of metrics for prerenders that get used. See  bug 648338  for more on this.

Comment 1 by bmcquade@chromium.org, Sep 20 2016 

To provide a little more context, the large number of ERR_IPC_WITH_NO_RELEVANT_LOADs is concerning because we don't know if it's just an artifact of prerender tracking or if there are actual bugs in the metrics tracking code causing us to fail to associate metrics data with the right page load. I believe its the former, but it's important to filter prerenders out ov ERR_IPC_WITH_NO_RELEVANT_LOAD in order to confirm this.
Project Member

Comment 2 by bugdroid1@chromium.org, Sep 22 2016 

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e8b60aa78b10f60af6d3f879385f5db1e8ac427a

commit e8b60aa78b10f60af6d3f879385f5db1e8ac427a
Author: bmcquade <bmcquade@chromium.org>
Date: Thu Sep 22 18:18:19 2016

Instantiate PageLoadTrackers for prerenders

This gets us closer to adding support for tracking prerenders ( bug 648338 ),
and addresses  bug 648341  where an internal error is logged every time a
prerender sends metrics data from the render process to the browser process.

BUG= 648341 

Review-Url: https://codereview.chromium.org/2354703002
Cr-Commit-Position: refs/heads/master@{#420398}

[modify] https://crrev.com/e8b60aa78b10f60af6d3f879385f5db1e8ac427a/chrome/browser/page_load_metrics/metrics_web_contents_observer.cc
[modify] https://crrev.com/e8b60aa78b10f60af6d3f879385f5db1e8ac427a/chrome/browser/page_load_metrics/metrics_web_contents_observer_unittest.cc

Comment 3 by bmcquade@chromium.org, Sep 25 2016

Status: Fixed (was: Started)
Data coming back from canary suggests that this issue is essentially addressed by the prerender change. The volume of ERR_IPC_WITH_NO_RELEVANT_LOADs is now 1% that of the number of NavigationToFirstContentfulPaints, well within reasonable levels.
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