Open Bug 1738247 Opened 3 years ago Updated 22 days ago

Videos stutter with Webrender Software compared to Firefox 78 esr

Categories

(Core :: Graphics: WebRender, defect)

Firefox 95
x86_64
Linux
defect

Tracking

()

Tracking Status
firefox95 --- wontfix

People

(Reporter: gfxreporter, Unassigned)

References

(Blocks 2 open bugs)

Details

(Keywords: perf, regression)

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

  1. Open Nightly to for example https://upload.wikimedia.org/wikipedia/commons/c/c3/Tour_of_the_Moon_in_4K.webm
  2. video will consistently stutter and have a lot of missed frames

This doesn't happen on Firefox 78esr (it's not buttery smooth but it's SIGNIFICANTLY worse on Nightly).

Here's what I got when I used the Firefox profiler:
https://profiler.firefox.com/from-browser/calltree/?globalTrackOrder=0w6&hiddenGlobalTracks=1245&localTrackOrderByPid=109127-x6x70wx5~109180-0~109324-0~109214-0~109457-0~109266-0~109412-01&thread=x9&timelineType=cpu-category&v=6

Here's my about:profile:

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    "userAgent": "Mozilla/5.0 (Windows NT 10.0; rv:91.0) Gecko/20100101 Firefox/91.0",
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    "updateChannel": "nightly",
    "supportURL": "https://support.mozilla.org/1/firefox/95.0a1/Linux/en-US/",
    "osTheme": "Adwaita / Adwaita",
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    "keySafebrowsingGoogleFound": true,
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    "MOZ_CRASHREPORTER_DATA_DIRECTORY": "/home/user/.mozilla/firefox/Crash Reports",
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    "MOZ_CRASHREPORTER_STRINGS_OVERRIDE": "/home/user/Downloads/firefox-84.0a1.en-US.linux-x86_64/firefox/browser/crashreporter-override.ini",
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    "XRE_PROFILE_LOCAL_PATH": "",
    "XRE_START_OFFLINE": "",
    "XRE_BINARY_PATH": "",
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        },
        {
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        {
          "name": "DMABUF",
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      "id": "addons-search-detection@mozilla.com"
    },
    {
      "name": "Amazon.com",
      "type": "extension",
      "version": "1.3",
      "isActive": true,
      "id": "amazondotcom@search.mozilla.org"
    },
    {
      "name": "Bing",
      "type": "extension",
      "version": "1.3",
      "isActive": true,
      "id": "bing@search.mozilla.org"
    },
    {
      "name": "DuckDuckGo",
      "type": "extension",
      "version": "1.1",
      "isActive": true,
      "id": "ddg@search.mozilla.org"
    },
    {
      "name": "Google",
      "type": "extension",
      "version": "1.1",
      "isActive": true,
      "id": "google@search.mozilla.org"
    },
    {
      "name": "Wikipedia (en)",
      "type": "extension",
      "version": "1.1",
      "isActive": true,
      "id": "wikipedia@search.mozilla.org"
    },
    {
      "name": "Containerise",
      "type": "extension",
      "version": "3.9.0",
      "isActive": false,
      "id": "containerise@kinte.sh"
    },
    {
      "name": "Easy Screenshot",
      "type": "extension",
      "version": "3.91",
      "isActive": false,
      "id": "easyscreenshot@mozillaonline.com"
    },
    {
      "name": "Greasemonkey",
      "type": "extension",
      "version": "4.11",
      "isActive": false,
      "id": "{e4a8a97b-f2ed-450b-b12d-ee082ba24781}"
    },
    {
      "name": "LocalCDN",
      "type": "extension",
      "version": "2.6.17",
      "isActive": false,
      "id": "{b86e4813-687a-43e6-ab65-0bde4ab75758}"
    },
    {
      "name": "SponsorBlock for YouTube - Skip Sponsorships",
      "type": "extension",
      "version": "3.4.1",
      "isActive": false,
      "id": "sponsorBlocker@ajay.app"
    },
    {
      "name": "uBlock Origin",
      "type": "extension",
      "version": "1.38.6",
      "isActive": false,
      "id": "uBlock0@raymondhill.net"
    },
    {
      "name": "User-Agent Switcher and Manager",
      "type": "extension",
      "version": "0.4.7.1",
      "isActive": false,
      "id": "{a6c4a591-f1b2-4f03-b3ff-767e5bedf4e7}"
    }
  ],
  "features": [
    {
      "name": "DoH Roll-Out",
      "version": "2.0.0",
      "id": "doh-rollout@mozilla.org"
    },
    {
      "name": "Firefox Screenshots",
      "version": "39.0.1",
      "id": "screenshots@mozilla.org"
    },
    {
      "name": "Form Autofill",
      "version": "1.0.1",
      "id": "formautofill@mozilla.org"
    },
    {
      "name": "Picture-In-Picture",
      "version": "1.0.0",
      "id": "pictureinpicture@mozilla.org"
    },
    {
      "name": "Proxy Failover",
      "version": "1.0.2",
      "id": "proxy-failover@mozilla.com"
    },
    {
      "name": "Web Compatibility Interventions",
      "version": "27.6.0",
      "id": "webcompat@mozilla.org"
    },
    {
      "name": "WebCompat Reporter",
      "version": "1.4.2",
      "id": "webcompat-reporter@mozilla.org"
    }
  ],
  "normandy": {
    "addonStudies": [],
    "prefRollouts": [
      {
        "slug": "bug-1705528-rollout-ongoing-fission-nightly-rollout-clone-nightly-90-100",
        "state": "active",
        "preferences": [
          {
            "preferenceName": "fission.experiment.enrollmentStatus",
            "value": 2,
            "previousValue": 0
          }
        ]
      }
    ],
    "prefStudies": [],
    "nimbusExperiments": [
      {
        "slug": "firefox-100-user-agent-nightly-95-96",
        "branch": {
          "slug": "version-100",
          "ratio": 1,
          "feature": {
            "value": {
              "firefoxVersion": 100
            },
            "enabled": true,
            "featureId": "firefox100"
          }
        },
        "active": true,
        "enrollmentId": "899ba272-f0cb-4b72-87c9-6a230077b8ae",
        "experimentType": "nimbus",
        "source": "rs-loader",
        "userFacingName": "Firefox 100 User-Agent Nightly 95-96",
        "userFacingDescription": "Testing website compatibility with a three-digit Firefox version number",
        "lastSeen": "2021-10-20T03:11:27.016Z",
        "featureIds": [
          "firefox100"
        ]
      }
    ],
    "remoteConfigs": [
      {
        "slug": "upgradeDialog-defaultEnabled",
        "enabled": true,
        "targeting": "true",
        "variables": {},
        "description": "Turn on upgradeDialog by default for all users",
        "featureId": "upgradeDialog"
      }
    ]
  }
}

OS is Qubes OS, you can replicate with a Xen VM with no hardware acceleration and 2 virtual cores.

Note I had dom.webgpu.enabled set to true since it somewhat improves thing, I will send another Firefox profile with that setting disabled.

The Bugbug bot thinks this bug should belong to the 'Core::WebRTC' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Component: Untriaged → WebRTC
Product: Firefox → Core
Component: WebRTC → Graphics: WebRender
Hardware: Unspecified → x86_64
Blocks: sw-wr-perf
Keywords: perf, regression
OS: Unspecified → Linux

Here's a profile with dom.webgpu.enabled set to its default value of false: https://share.firefox.dev/3vRU7tj

Can you get a profile of ESR 78 in the same configuration to compare?

Flags: needinfo?(gfxreporter)

(In reply to Jeff Muizelaar [:jrmuizel] from comment #4)

Can you get a profile of ESR 78 in the same configuration to compare?

The profiler in ESR 78 doesn't have the graphics option in the settings so I choose custom and tried to save everything possible: https://share.firefox.dev/3jMuGV6 Hope this helps.

Flags: needinfo?(gfxreporter)

Another more prominent example is the WebRender Moire demo (which better captures CSS performance) which illustrates the clear difference:

ESR 78: https://share.firefox.dev/3mnkO5U (no stuttering, smooth but low FPS)

Firefox Nightly: https://share.firefox.dev/3jMnYi7 (at first the window UIs completely freezes, then we get 0.1-0.2 FPS or even lower, anyway it was extremely laggy and unusable)

Software WebRender should at least have the same parity with the older compositor if not better performance.

I was able to collect more profiles from a machine with a Ryzen 5 mobile CPU (but was locked at 1 Ghz) and with Windows 10. The Moire demo was clearly significantly worse than when I used standard WebRender as it completely froze the window and it had 0.1 FPS or something similar. (I used a fresh install of Firefox Nightly)

Moire demo:

wr https://share.firefox.dev/3ByiugG

wr-software d3d11 (WebRender (Software D3D11) in about:support) https://share.firefox.dev/3BvuPCC

wr-software opengl set to true and d3d11 set to false but i didn't see any changes to the compositor section of about:support https://share.firefox.dev/3nM74RS

wr-software (WebRender (Software) in about:support) https://share.firefox.dev/2ZFGt0b

More tests:

4k video https://upload.wikimedia.org/wikipedia/commons/c/c3/Tour_of_the_Moon_in_4K.webm

wr https://share.firefox.dev/3mvJd9J

wr-software d3d11 https://share.firefox.dev/3GG04OO

wr-software https://share.firefox.dev/2ZAD17a

8k video https://upload.wikimedia.org/wikipedia/commons/f/f3/Mandelbox_4D_W-Transformation_8K_FUHD_50FPS.webm

(in both cases they weren't smooth and had long stutters)

wr https://share.firefox.dev/2ZF9A3H

wr-software https://share.firefox.dev/2ZC2q0q

about:support:

{
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    "name": "Firefox",
    "osVersion": "Windows_NT 10.0 19042",
    "version": "95.0a1",
    "buildID": "20211031095403",
    "distributionID": "",
    "userAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:95.0) Gecko/20100101 Firefox/95.0",
    "safeMode": false,
    "updateChannel": "nightly",
    "supportURL": "https://support.mozilla.org/1/firefox/95.0a1/WINNT/fr/",
    "osTheme": "",
    "numTotalWindows": 1,
    "numFissionWindows": 0,
    "numRemoteWindows": 1,
    "launcherProcessState": 0,
    "fissionAutoStart": false,
    "fissionDecisionStatus": "disabledByDefault",
    "remoteAutoStart": true,
    "policiesStatus": 0,
    "keyLocationServiceGoogleFound": true,
    "keySafebrowsingGoogleFound": true,
    "keyMozillaFound": true
  },
  "securitySoftware": {
    "registeredAntiVirus": "Microsoft Defender Antivirus",
    "registeredAntiSpyware": "",
    "registeredFirewall": "Windows Firewall"
  },
  "processes": {
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      "extension": 1,
      "privilegedabout": 1,
      "web": 2,
      "prealloc": 1,
      "gpu": 1,
      "socket": 1
    },
    "maxWebContentProcesses": 8
  },
  "environmentVariables": {
    "MOZ_CRASHREPORTER_DATA_DIRECTORY": "C:\\Users\\user\\AppData\\Roaming\\Mozilla\\Firefox\\Crash Reports",
    "MOZ_CRASHREPORTER_EVENTS_DIRECTORY": "C:\\Users\\user\\AppData\\Roaming\\Mozilla\\Firefox\\Profiles\\6d4wpjlw.default-nightly\\crashes\\events",
    "MOZ_CRASHREPORTER_PING_DIRECTORY": "C:\\Users\\user\\AppData\\Roaming\\Mozilla\\Firefox\\Pending Pings",
    "MOZ_CRASHREPORTER_RESTART_ARG_0": "C:\\Program Files\\Firefox Nightly\\firefox.exe",
    "MOZ_CRASHREPORTER_RESTART_ARG_1": "-first-startup",
    "MOZ_CRASHREPORTER_STRINGS_OVERRIDE": "C:\\Program Files\\Firefox Nightly\\browser\\crashreporter-override.ini"
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  "modifiedPreferences": {
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    "browser.urlbar.placeholderName": "Google",
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    "media.gmp-widevinecdm.abi": "x86_64-msvc-x64",
    "media.gmp.storage.version.observed": 1,
    "media.hardware-video-decoding.failed": false,
    "media.gmp-gmpopenh264.version": "1.8.1.1",
    "media.gmp-widevinecdm.version": "4.10.2209.1",
    "media.gmp-gmpopenh264.abi": "x86_64-msvc-x64",
    "network.trr.blocklist_cleanup_done": true,
    "privacy.sanitize.pending": "[{\"id\":\"newtab-container\",\"itemsToClear\":[],\"options\":{}}]",
    "security.sandbox.content.tempDirSuffix": "{f72d874d-6ca4-49ac-a22e-40cfe46402ad}",
    "ui.osk.debug.keyboardDisplayReason": "IKPOS: Touch screen not found."
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  "lockedPreferences": {
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  },
  "printingPreferences": {},
  "media": {
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    "currentMaxAudioChannels": 2,
    "currentPreferredSampleRate": 48000,
    "audioOutputDevices": [
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      {
        "name": "NVIDIA Output (NVIDIA High Definition Audio)",
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      {
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      {
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}
Severity: -- → S4

The bug has a release status flag that shows some version of Firefox is affected, thus it will be considered confirmed.

Status: UNCONFIRMED → NEW
Ever confirmed: true

I can confirm that the issue is still present with the latest Nightly 104.0a1 - Build ID 20220712093327.

Summary: Videos stutter with Webrender Software on a Xen VM with no hardware acceleration compared to Firefox 78 esr → Videos stutter with Webrender Software compared to Firefox 78 esr
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