Direct RGBA receive: native write CPU and elapsed time

Method

This diagnostic measures calling-thread CPU time around the existing native HTTP packet write call.

Noisedeck A sends 1920 × 1080 RGBA packets through Sync to Noisedeck B. Native camera publication remains active.

B uses the existing HTTP BYOB reader. The source limit remains two packets, or 16,588,928 bytes. Receiver credit remains one.

The browser, source encoder, renderer and queue policy retain their frozen BUDGET2 bytes. Only the native timing diagnostic changes.

The tests use GLSL and synth.testPattern. Timing uses pattern 0 with gridSize 4. Pixel controls use pattern 5 with gridSize 16.

Retained host metadata identifies an Apple M2, eight logical CPUs, 24 GiB of memory and Darwin 23.6.0.

Observed power samples show AC power. They do not prove continuous AC power between reads. The tests include no in-run thermal or frequency measurements.

Delivery observations

Four fresh pixel controls and four observations passed. The observations include two five-second and two three-minute runs.

The long observations retain all 360 complete B seconds and both partial tails. The short observations retain ten complete seconds and both tails.

Input and final markers must match within the same render. Rates use the full measurement span, including the tail.

Web averaged 54.863649 unique pairs/s, with 41 complete seconds below 50. Desktop averaged 58.467740, with four below 50.

These instrumented sequential runs do not establish sustained 60 frames/s, a causal ranking or released-product performance.

Native CPU and elapsed time

Native records cover each entire native lifetime, including setup and cleanup. Their clocks have no measured alignment to either page clock.

The original elapsed timer surrounds uv_write. A calling-thread CPU read precedes that timer and another follows it.

The CPU difference includes calling-thread user and kernel execution. It is not the exact CPU time of the inner write interval.

The CPU clock advances only while the calling thread executes. The elapsed clock-read brackets can include scheduling delay.

Web recorded 10,176 calls and seven elapsed calls of at least 25 ms. Desktop recorded 10,827 calls and two such calls.

The longest web call took 227.731292 ms elapsed and 4.019 ms outer-window CPU. The longest desktop call took 42.512834 ms and 3.087167 ms.

The difference between elapsed and CPU time does not identify the cause. These records do not distinguish descheduling from a system wait.

CPU records have no clock errors, rejected records or overwritten events. All retained slow records and the separate worst record remain in the numeric data.

Clock-read brackets and native event loss

The fixed recorder uses 22,744 bytes and permits 20,000 calls. That recorder adds no per-call dynamic allocation.

The bracket measurements include the CPU clock reads and surrounding elapsed time. They exclude later recorder validation and storage.

The diagnostic subtracts no overhead. The brackets do not measure total instrumentation overhead.

The existing write-callback elapsed measurement now includes the added CPU reads and recorder work after submission.

The older six-stage ring overwrote 785 of 1,041 web events and 92 of 348 desktop events. Each retained 256 records.

Its aggregate counts, elapsed totals and maxima remain available. Individual lost records cannot be reconstructed.

The web maximum has no retained individual native callback record. Its separate CPU record remains available.

Source intervals

The source pressure recorder keeps positive checks and actual drops. It does not record continuous socket occupancy.

Measured A intervals recorded 541 web drops and 152 desktop drops, all at admission or before encoding.

These source intervals use their own page clocks. Their durations differ from the B measurement spans and native lifetimes.

Frame sequences can join identities across processes. They do not establish latency or simultaneous clock readings.

Rejected web attempt

The first web five-second attempt was not accepted. The source renderer was not running before cleanup.

The source pattern identity and sender/bridge checks remained available. The stop caller was not recorded.

The attempt retained 71 matched pairs with no invalid markers. It has no accepted rate or accepted cell journal.

All actual browser and native processes exited. Source, pressure and cell journals are incomplete. A and B telemetry journals are complete.

The native lifetime independently passed CPU and ownership checks. It recorded 358 writes and one slow write.

That write took 32.551750 ms elapsed and 3.653250 ms outer-window CPU. Its frame sequence was 52. The source measurement started at sequence 312.

The slow write belongs to a frame with a lower source sequence than the start-cut sequence. This does not align native and page clocks.

The unchanged five-second repeat passed and remains a separate result.

Scope and references

These records do not establish a garbage collection cause, thermal cause, external camera delivery or hours-long behavior.

No uninstrumented run with identical scheduling conditions is available. The earlier source-budget reports remain separate.

The data retains result, source-manifest, native-receipt and journal digests. The candidate has not shipped as a product update.

Context | Run | Unique pairs | Elapsed ms | Pairs/s | Input min | Final min | Input below50 | Final below50
web | observe5 | 293 | 5024.799999237061 | 58.310779 | 56 | 56 | 0 | 0
web | observe180 | 9876 | 180009.90000152588 | 54.863649 | 32 | 32 | 41 | 41
desktop | observe5 | 295 | 5006.900001525879 | 58.918692 | 54 | 54 | 0 | 0
desktop | observe180 | 10525 | 180013.8000011444 | 58.467740 | 36 | 36 | 4 | 4
Context | Run | Tail ms | Input tail | Final tail
web | observe5 | 24.799999237060547 | 2 | 2
web | observe180 | 9.900001525878906 | 0 | 0
desktop | observe5 | 6.900001525878906 | 1 | 1
desktop | observe180 | 13.80000114440918 | 0 | 0
Context | Gate | Status | Native calls | Native slow calls | Result SHA256
web | positive | Pass | 577 | 0 | 238479620f001af4b2098bf9880fb3cb53df8a29c4b286a95174a5ad871817b2
web | negative | Pass | 527 | 1 | 0b4c57e3f0b3d94b365a7a726a9273c3776a7a1492d7cc772732f7568564b220
web | observe5 | Pass | 581 | 0 | 865997ff65101c84485c26340e1d40c0acaece6dfb6a932fd71a43f0924ec5b9
web | observe180 | Pass | 10176 | 7 | 4dade0ebba66bfd51e69e3a7c4f4a2cc2513224be3a44321264ba093d884644c
desktop | positive | Pass | 580 | 0 | e79194134af9a8631d4c1d844959647bc74a2cc45a0d15863368ce74fb5f868b
desktop | negative | Pass | 582 | 0 | bb789d0969bacbc405dc187482352dc086dc1538fad7f3e92d5cd78d0e1a3d3c
desktop | observe5 | Pass | 596 | 0 | 1527b56d0b8a8ac1a137c92982c40f66597f61c58c5394e213c321c514907f30
desktop | observe180 | Pass | 10827 | 2 | 06eb8c2d7725d438d1cc1ae27f85d005c1f69883b6b732079d64d55410df5d84
Context | A browser | B browser | Start UTC | End UTC | Observed AC samples
web | Chrome/152.0.7977.83 | Chrome/152.0.7977.83 | 2026-09-09T09:33:51.967Z | 2026-09-09T09:37:21.155Z | 5
desktop | Chrome/148.0.7778.180 | Chrome/148.0.7778.180 | 2026-09-09T09:37:21.389Z | 2026-09-09T09:40:54.268Z | 5
Full native CPU | web | {"afterBracketMaxUs": 2919.833, "afterBracketMeanUs": 3.730280758647799, "beforeBracketMaxUs": 643.167, "beforeBracketMeanUs": 1.9978887578616351, "completeSlowHistory": true, "count": 10176, "meanCpuOuterMs": 3.4673897102004716, "meanWallMs": 4.922948394359277, "raw": {"callCapacity": 20000, "clockReadAfterMaxNs": "2919833", "clockReadAfterTotalNs": "37959337", "clockReadBeforeMaxNs": "643167", "clockReadBeforeTotalNs": "20330516", "count": 10176, "cpuClock": "CLOCK_THREAD_CPUTIME_ID", "cpuOuterTotalNs": "35284157691", "cpuScope": "calling-thread-user-plus-kernel", "cpuWindowContainsWallWindow": true, "errorRecords": 0, "eventCapacity": 256, "eventCount": 7, "events": [{"cpuAfterError": 0, "cpuAfterNs": "14156180541", "cpuBeforeError": 0, "cpuBeforeNs": "14152161541", "errors": 0, "generation": "14269148266159809238", "index": 2232, "outerAfterNs": "15706074096371583", "outerBeforeNs": "15706073868635041", "sequence": "2250", "writeEndNs": "15706074096368000", "writeResult": 0, "writeStartNs": "15706073868636708"}, {"cpuAfterError": 0, "cpuAfterNs": "55488516250", "cpuBeforeError": 0, "cpuBeforeNs": "55485212791", "errors": 0, "generation": "14269148266159809238", "index": 7018, "outerAfterNs": "15706160491394375", "outerBeforeNs": "15706160464910875", "sequence": "7447", "writeEndNs": "15706160491392458", "writeResult": 0, "writeStartNs": "15706160464912041"}, {"cpuAfterError": 0, "cpuAfterNs": "56115916333", "cpuBeforeError": 0, "cpuBeforeNs": "56112877125", "errors": 0, "generation": "14269148266159809238", "index": 7068, "outerAfterNs": "15706161785815750", "outerBeforeNs": "15706161755873916", "sequence": "7520", "writeEndNs": "15706161785813833", "writeResult": 0, "writeStartNs": "15706161755875541"}, {"cpuAfterError": 0, "cpuAfterNs": "56950227041", "cpuBeforeError": 0, "cpuBeforeNs": "56947096708", "errors": 0, "generation": "14269148266159809238", "index": 7123, "outerAfterNs": "15706163405963833", "outerBeforeNs": "15706163363757875", "sequence": "7618", "writeEndNs": "15706163405962250", "writeResult": 0, "writeStartNs": "15706163363760083"}, {"cpuAfterError": 0, "cpuAfterNs": "80837416291", "cpuBeforeError": 0, "cpuBeforeNs": "80834201083", "errors": 0, "generation": "14269148266159809238", "index": 9231, "outerAfterNs": "15706203477034541", "outerBeforeNs": "15706203445557250", "sequence": "10022", "writeEndNs": "15706203477031625", "writeResult": 0, "writeStartNs": "15706203445558666"}, {"cpuAfterError": 0, "cpuAfterNs": "82618523250", "cpuBeforeError": 0, "cpuBeforeNs": "82616445833", "errors": 0, "generation": "14269148266159809238", "index": 9410, "outerAfterNs": "15706207072387083", "outerBeforeNs": "15706207027111916", "sequence": "10241", "writeEndNs": "15706207072385125", "writeResult": 0, "writeStartNs": "15706207027113208"}, {"cpuAfterError": 0, "cpuAfterNs": "84104090583", "cpuBeforeError": 0, "cpuBeforeNs": "84102453333", "errors": 0, "generation": "14269148266159809238", "index": 9543, "outerAfterNs": "15706209951194166", "outerBeforeNs": "15706209921418166", "sequence": "10409", "writeEndNs": "15706209951192041", "writeResult": 0, "writeStartNs": "15706209921420041"}], "overheadSubtracted": false, "overwrittenEvents": 0, "pairedCount": 10176, "rejectedRecords": 0, "schema": "native-write-cpu-v2", "scope": "HTTP-packet-uv_write-call", "slowCount": 7, "slowThresholdNs": 25000000, "storageBytes": 22744, "valid": true, "wallClock": "uv_hrtime", "wallTotalNs": "50095922861", "wallValidCount": 10176, "worstWall": {"cpuAfterError": 0, "cpuAfterNs": "14156180541", "cpuBeforeError": 0, "cpuBeforeNs": "14152161541", "errors": 0, "generation": "14269148266159809238", "index": 2232, "outerAfterNs": "15706074096371583", "outerBeforeNs": "15706073868635041", "sequence": "2250", "writeEndNs": "15706074096368000", "writeResult": 0, "writeStartNs": "15706073868636708"}}, "scope": "native lifetime including setup and cleanup", "slow": [{"afterBracketUs": 3.583, "beforeBracketUs": 1.667, "cpuOuterMs": 4.019, "generation": "14269148266159809238", "index": 2232, "sequence": "2250", "wallMs": 227.731292, "writeEndMs": 37805.534, "writeStartMs": 37577.802708}, {"afterBracketUs": 1.917, "beforeBracketUs": 1.166, "cpuOuterMs": 3.303459, "generation": "14269148266159809238", "index": 7018, "sequence": "7447", "wallMs": 26.480417, "writeEndMs": 124200.558458, "writeStartMs": 124174.078041}, {"afterBracketUs": 1.917, "beforeBracketUs": 1.625, "cpuOuterMs": 3.039208, "generation": "14269148266159809238", "index": 7068, "sequence": "7520", "wallMs": 29.938292, "writeEndMs": 125494.979833, "writeStartMs": 125465.041541}, {"afterBracketUs": 1.583, "beforeBracketUs": 2.208, "cpuOuterMs": 3.130333, "generation": "14269148266159809238", "index": 7123, "sequence": "7618", "wallMs": 42.202167, "writeEndMs": 127115.12825, "writeStartMs": 127072.926083}, {"afterBracketUs": 2.916, "beforeBracketUs": 1.416, "cpuOuterMs": 3.215208, "generation": "14269148266159809238", "index": 9231, "sequence": "10022", "wallMs": 31.472959, "writeEndMs": 167186.197625, "writeStartMs": 167154.724666}, {"afterBracketUs": 1.958, "beforeBracketUs": 1.292, "cpuOuterMs": 2.077417, "generation": "14269148266159809238", "index": 9410, "sequence": "10241", "wallMs": 45.271917, "writeEndMs": 170781.551125, "writeStartMs": 170736.279208}, {"afterBracketUs": 2.125, "beforeBracketUs": 1.875, "cpuOuterMs": 1.63725, "generation": "14269148266159809238", "index": 9543, "sequence": "10409", "wallMs": 29.772, "writeEndMs": 173660.358041, "writeStartMs": 173630.586041}], "spanMs": 188336.557166, "worst": {"afterBracketUs": 3.583, "beforeBracketUs": 1.667, "cpuOuterMs": 4.019, "generation": "14269148266159809238", "index": 2232, "sequence": "2250", "wallMs": 227.731292, "writeEndMs": 37805.534, "writeStartMs": 37577.802708}}
Full native CPU | desktop | {"afterBracketMaxUs": 467.791, "afterBracketMeanUs": 3.6381325390228136, "beforeBracketMaxUs": 528.208, "beforeBracketMeanUs": 2.202276346171608, "completeSlowHistory": true, "count": 10827, "meanCpuOuterMs": 3.4962104153505127, "meanWallMs": 5.119770563221576, "raw": {"callCapacity": 20000, "clockReadAfterMaxNs": "467791", "clockReadAfterTotalNs": "39390061", "clockReadBeforeMaxNs": "528208", "clockReadBeforeTotalNs": "23844046", "count": 10827, "cpuClock": "CLOCK_THREAD_CPUTIME_ID", "cpuOuterTotalNs": "37853470167", "cpuScope": "calling-thread-user-plus-kernel", "cpuWindowContainsWallWindow": true, "errorRecords": 0, "eventCapacity": 256, "eventCount": 2, "events": [{"cpuAfterError": 0, "cpuAfterNs": "31384423875", "cpuBeforeError": 0, "cpuBeforeNs": "31381336708", "errors": 0, "generation": "15450479024677301587", "index": 3752, "outerAfterNs": "15706313048242625", "outerBeforeNs": "15706313005727041", "sequence": "3889", "writeEndNs": "15706313048241125", "writeResult": 0, "writeStartNs": "15706313005728291"}, {"cpuAfterError": 0, "cpuAfterNs": "85241805250", "cpuBeforeError": 0, "cpuBeforeNs": "85238959500", "errors": 0, "generation": "15450479024677301587", "index": 10058, "outerAfterNs": "15706420298112125", "outerBeforeNs": "15706420268145083", "sequence": "10314", "writeEndNs": "15706420298109833", "writeResult": 0, "writeStartNs": "15706420268146333"}], "overheadSubtracted": false, "overwrittenEvents": 0, "pairedCount": 10827, "rejectedRecords": 0, "schema": "native-write-cpu-v2", "scope": "HTTP-packet-uv_write-call", "slowCount": 2, "slowThresholdNs": 25000000, "storageBytes": 22744, "valid": true, "wallClock": "uv_hrtime", "wallTotalNs": "55431755888", "wallValidCount": 10827, "worstWall": {"cpuAfterError": 0, "cpuAfterNs": "31384423875", "cpuBeforeError": 0, "cpuBeforeNs": "31381336708", "errors": 0, "generation": "15450479024677301587", "index": 3752, "outerAfterNs": "15706313048242625", "outerBeforeNs": "15706313005727041", "sequence": "3889", "writeEndNs": "15706313048241125", "writeResult": 0, "writeStartNs": "15706313005728291"}}, "scope": "native lifetime including setup and cleanup", "slow": [{"afterBracketUs": 1.5, "beforeBracketUs": 1.25, "cpuOuterMs": 3.087167, "generation": "15450479024677301587", "index": 3752, "sequence": "3889", "wallMs": 42.512834, "writeEndMs": 64970.013125, "writeStartMs": 64927.500291}, {"afterBracketUs": 2.292, "beforeBracketUs": 1.25, "cpuOuterMs": 2.84575, "generation": "15450479024677301587", "index": 10058, "sequence": "10314", "wallMs": 29.9635, "writeEndMs": 172219.881833, "writeStartMs": 172189.918333}], "spanMs": 188203.864333, "worst": {"afterBracketUs": 1.5, "beforeBracketUs": 1.25, "cpuOuterMs": 3.087167, "generation": "15450479024677301587", "index": 3752, "sequence": "3889", "wallMs": 42.512834, "writeEndMs": 64970.013125, "writeStartMs": 64927.500291}}
Context | Lifetime s | Calls | Mean elapsed ms | Mean outer CPU ms | Slow calls | CPU events overwritten
web | 188.336557166 | 10176 | 4.922948 | 3.467390 | 7 | 0
desktop | 188.203864333 | 10827 | 5.119771 | 3.496210 | 2 | 0
Context | Call index | Sequence | Native start s | Elapsed ms | Outer CPU ms | Before bracket us | After bracket us
web | 2232 | 2250 | 37.577803 | 227.731292 | 4.019000 | 1.667 | 3.583
web | 7018 | 7447 | 124.174078 | 26.480417 | 3.303459 | 1.166 | 1.917
web | 7068 | 7520 | 125.465042 | 29.938292 | 3.039208 | 1.625 | 1.917
web | 7123 | 7618 | 127.072926 | 42.202167 | 3.130333 | 2.208 | 1.583
web | 9231 | 10022 | 167.154725 | 31.472959 | 3.215208 | 1.416 | 2.916
web | 9410 | 10241 | 170.736279 | 45.271917 | 2.077417 | 1.292 | 1.958
web | 9543 | 10409 | 173.630586 | 29.772000 | 1.637250 | 1.875 | 2.125
desktop | 3752 | 3889 | 64.927500 | 42.512834 | 3.087167 | 1.25 | 1.5
desktop | 10058 | 10314 | 172.189918 | 29.963500 | 2.845750 | 1.25 | 2.292
Context | Before total ns | Before mean us | Before max us | After total ns | After mean us | After max us
web | 20330516 | 1.997889 | 643.167 | 37959337 | 3.730281 | 2919.833
desktop | 23844046 | 2.202276 | 528.208 | 39390061 | 3.638133 | 467.791
Context | Stage | Count | Mean elapsed ms | Max elapsed ms | All-stage slow events | All-stage overwritten
web | ingestGap | 10742 | 17.519238 | 257.426 | 1041 | 785
web | tapCopy | 10563 | 0.979369 | 24.321 | 1041 | 785
web | cameraPublish | 10742 | 1.231697 | 42.708 | 1041 | 785
web | writeSubmit | 10176 | 4.922469 | 227.731 | 1041 | 785
web | writeCallback | 10176 | 5.049630 | 227.751 | 1041 | 785
web | ackCallback | 10175 | 17.530103 | 255.867 | 1041 | 785
desktop | ingestGap | 11134 | 16.892118 | 190.01 | 348 | 92
desktop | tapCopy | 10952 | 0.754961 | 46.864 | 348 | 92
desktop | cameraPublish | 11134 | 0.959900 | 63.846 | 348 | 92
desktop | writeSubmit | 10827 | 5.119290 | 42.512 | 348 | 92
desktop | writeCallback | 10827 | 5.231919 | 42.519 | 348 | 92
desktop | ackCallback | 10826 | 16.712800 | 173.252 | 348 | 92
Context | A elapsed s | Offers | Accepted | Sent | Admission drops | Pre-encode drops | Post-encode drops | All pressure drops
web | 180.08710000038147 | 10806 | 10508 | 10265 | 298 | 243 | 0 | 541
desktop | 180.09129999923707 | 10806 | 10713 | 10654 | 93 | 59 | 0 | 152
Attempt | Accepted FPS | Native calls | Elapsed slow ms | Outer CPU ms | Slow sequence | Source start sequence
web-observe5-ncpuv2-a1 | None | 358 | 32.55175 | 3.65325 | 52 | 312
Rejected attempt | {"accepted": false, "acceptedCells": 0, "artifactSHA256": {"cells": "1cafa699a3b752b5af446cde337864a7df76ddafe72380055861054dc8dae3fe", "pressure": "e2116fd69ab191fb22312769e4515a5bf917aeb454e3287a50806f8a791bdf12", "result": "ca5fce9a08deb791e63fac2c42c0e10caedeeb4ac622971e73d8df3929f5fa81", "source": "4b242f9294fd473e5e574f582d9df0cdcdb1785803c17c7a1040746cfeeba3e9", "telemetryA": "37b6766baba995b48b2aed4217481cdb28130a91a2771703ce953959e96f0508", "telemetryB": "a0fb8ed1f399a18d7351ba8d8e7e3a1fcc457d6ef0bcc7002420e2b9bc19b658"}, "cleanupComplete": false, "context": "web", "cpu": {"afterBracketMaxUs": 278.167, "afterBracketMeanUs": 3.900502793296089, "beforeBracketMaxUs": 69, "beforeBracketMeanUs": 1.509650837988827, "completeSlowHistory": true, "count": 358, "meanCpuOuterMs": 3.1479534301675978, "meanWallMs": 4.933300860335195, "raw": {"callCapacity": 20000, "clockReadAfterMaxNs": "278167", "clockReadAfterTotalNs": "1396380", "clockReadBeforeMaxNs": "69000", "clockReadBeforeTotalNs": "540455", "count": 358, "cpuClock": "CLOCK_THREAD_CPUTIME_ID", "cpuOuterTotalNs": "1126967328", "cpuScope": "calling-thread-user-plus-kernel", "cpuWindowContainsWallWindow": true, "errorRecords": 0, "eventCapacity": 256, "eventCount": 1, "events": [{"cpuAfterError": 0, "cpuAfterNs": "404767875", "cpuBeforeError": 0, "cpuBeforeNs": "401114625", "errors": 0, "generation": "1919862898485516439", "index": 44, "outerAfterNs": "15705646570363458", "outerBeforeNs": "15705646537806958", "sequence": "52", "writeEndNs": "15705646570359958", "writeResult": 0, "writeStartNs": "15705646537808208"}], "overheadSubtracted": false, "overwrittenEvents": 0, "pairedCount": 358, "rejectedRecords": 0, "schema": "native-write-cpu-v2", "scope": "HTTP-packet-uv_write-call", "slowCount": 1, "slowThresholdNs": 25000000, "storageBytes": 22744, "valid": true, "wallClock": "uv_hrtime", "wallTotalNs": "1766121708", "wallValidCount": 358, "worstWall": {"cpuAfterError": 0, "cpuAfterNs": 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