It appears that we are indeed limited by the SVG filter. Based on comment 8 and comment 10 I made `nsSVGIntegrationUtils::PaintFilter` a no-op and the reported download bandwidth almost doubled. Baseline gv_example (local release build) ``` Download (Mbps): 37.1, 37.1, 37.8 Upload (Mbps): 19.8, 19.8, 17.7 ``` gv_example (local release build but skipping `nsSVGIntegrationUtils::PaintFilter`: https://searchfox.org/mozilla-central/rev/11712bd3ce7454923e5931fa92eaf9c01ef35a0a/layout/svg/nsSVGIntegrationUtils.cpp#1057 ``` Download (Mbps): 62.9, 63.0, 62.4 Upload (Mbps): 20.4, 20.3, 20.2 ``` My home network is 250Mbps down and 20Mbps upload so I'm near the upload limit. On Chrome I'm seeing ~100Mbps download. I have a preference for independently-verified results, so if someone else who can repro the issue would like to repeat the test, that would be great. But this makes me think: - Is this an isolated problem? An expensive filter running during their test, or could this impact pageload of real sites? I'll start a tp6m job to test this hypothesis. - It's great that we may be getting decryption optimizations out of this. But is there anything else we can do about the graphics side prior to WebRender + SVG?
Bug 1556022 Comment 17 Edit History
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It appears that we are indeed limited by the SVG filter. Based on comment 8 and comment 10 I made `nsSVGIntegrationUtils::PaintFilter` a no-op and the reported download bandwidth almost doubled. Baseline gv_example (local release build, Moto G5) ``` Download (Mbps): 37.1, 37.1, 37.8 Upload (Mbps): 19.8, 19.8, 17.7 ``` gv_example (local release build, , Moto G5, but skipping `nsSVGIntegrationUtils::PaintFilter`): https://searchfox.org/mozilla-central/rev/11712bd3ce7454923e5931fa92eaf9c01ef35a0a/layout/svg/nsSVGIntegrationUtils.cpp#1057 ``` Download (Mbps): 62.9, 63.0, 62.4 Upload (Mbps): 20.4, 20.3, 20.2 ``` My home network is 250Mbps down and 20Mbps upload so I'm near the upload limit. On Chrome I'm seeing ~100Mbps download. I have a preference for independently-verified results, so if someone else who can repro the issue would like to repeat the test, that would be great. But this makes me think: - Is this an isolated problem? An expensive filter running during their test, or could this impact pageload of real sites? I'll start a tp6m job to test this hypothesis. - It's great that we may be getting decryption optimizations out of this. But is there anything else we can do about the graphics side prior to WebRender + SVG?