[Webkit-unassigned] [Bug 94175] New: [Chromium] Compositor hangs while updating resources if vsync is disabled.

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Aug 15 19:59:29 PDT 2012


           Summary: [Chromium] Compositor hangs while updating resources
                    if vsync is disabled.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: reveman at chromium.org
                CC: nduca at chromium.org, jbates at google.com

Looks like manual vsync ticks are not generated when scheduler is updating resources. This happens when there's nothing to draw but resources to update. To reproduce go to a page that generates more than 48 resource updates per frame. E.g. http://www.corp.google.com/~reveman/texture-uploads/test.html with the browser window relatively large.    Or it will reproduce on any composited page after lowering the textureUpdatesPerFrame constant in CCTextureUpdateController.cpp to 5.

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