docs(yellow-paper): private DA metering

[just-mitch]

Please see the changes to the docs for the proposed design.

[just-mitch]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• docs(yellow-paper): private DA metering #5388 👈
• feat: add gas costs to TxEffect #5337
• master

This stack of pull requests is managed by Graphite. Learn more about stacking.

Join @just-mitch and the rest of your teammates on Graphite

[AztecBot]

Benchmark results

Metrics with a significant change:

• batch_insert_into_append_only_tree_32_depth_ms (512): 231 (-25%)
• note_trial_decrypting_time_in_ms (32): 102 (+97%)

Detailed results

All benchmarks are run on txs on the Benchmarking contract on the repository. Each tx consists of a batch call to create_note and increment_balance, which guarantees that each tx has a private call, a nested private call, a public call, and a nested public call, as well as an emitted private note, an unencrypted log, and public storage read and write.

This benchmark source data is available in JSON format on S3 here.

Values are compared against data from master at commit 41107e34 and shown if the difference exceeds 1%.

L2 block published to L1

Each column represents the number of txs on an L2 block published to L1.

Metric	8 txs	32 txs	64 txs
l1_rollup_calldata_size_in_bytes	676	676	676
l1_rollup_calldata_gas	6,412	6,424	6,412
l1_rollup_execution_gas	585,745	585,757	585,745
l2_block_processing_time_in_ms	1,289 (-13%)	4,779 (+1%)	9,455 (+4%)
note_successful_decrypting_time_in_ms	157 (-18%)	484 (-10%)	960 (-4%)
note_trial_decrypting_time_in_ms	60.6 (-39%)	⚠️ 102 (+97%)	90.0 (-32%)
l2_block_building_time_in_ms	17,272	65,460	130,153
l2_block_rollup_simulation_time_in_ms	7,892 (-1%)	28,164 (-1%)	55,400 (-1%)
l2_block_public_tx_process_time_in_ms	9,361	37,243	74,654 (+1%)

L2 chain processing

Each column represents the number of blocks on the L2 chain where each block has 16 txs.

Metric	5 blocks	10 blocks
node_history_sync_time_in_ms	13,733 (+1%)	26,436 (-3%)
note_history_successful_decrypting_time_in_ms	1,278 (+3%)	2,425 (+2%)
note_history_trial_decrypting_time_in_ms	97.8 (+19%)	140 (+18%)
node_database_size_in_bytes	18,645,072	35,102,800
pxe_database_size_in_bytes	29,859	59,414

Circuits stats

Stats on running time and I/O sizes collected for every circuit run across all benchmarks.

Circuit	circuit_simulation_time_in_ms	circuit_input_size_in_bytes	circuit_output_size_in_bytes
private-kernel-init	248 (+3%)	44,344	28,181
private-kernel-ordering	214	52,847	14,263
base-parity	4,612 (+4%)	128	311
root-parity	1,607	1,244	311
base-rollup	17,935 (-1%)	165,727	861
root-rollup	50.0	4,359	725
private-kernel-inner	598	73,728	28,181
public-kernel-app-logic	401	35,185	28,151
public-kernel-tail	172 (-1%)	40,862	28,151
merge-rollup	7.54 (-10%)	2,568	861

Tree insertion stats

The duration to insert a fixed batch of leaves into each tree type.

Metric	1 leaves	16 leaves	64 leaves	128 leaves	512 leaves	1024 leaves	2048 leaves	4096 leaves	32 leaves
batch_insert_into_append_only_tree_16_depth_ms	9.99	15.9 (-1%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_count	16.8	31.6	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_16_depth_hash_ms	0.584	0.493 (-1%)	N/A	N/A	N/A	N/A	N/A	N/A	N/A
batch_insert_into_append_only_tree_32_depth_ms	N/A	N/A	45.6	72.1	⚠️ 231 (-25%)	447 (+1%)	861 (-1%)	1,724	N/A
batch_insert_into_append_only_tree_32_depth_hash_count	N/A	N/A	96.0	159	543	1,055	2,079	4,127	N/A
batch_insert_into_append_only_tree_32_depth_hash_ms	N/A	N/A	0.469	0.446	0.422 (-25%)	0.417	0.411	0.414	N/A
batch_insert_into_indexed_tree_20_depth_ms	N/A	N/A	53.4	106	334 (-14%)	658	1,306	2,603 (-1%)	N/A
batch_insert_into_indexed_tree_20_depth_hash_count	N/A	N/A	104	207	691	1,363	2,707	5,395	N/A
batch_insert_into_indexed_tree_20_depth_hash_ms	N/A	N/A	0.477	0.479	0.455 (-14%)	0.454	0.453	0.451 (-1%)	N/A
batch_insert_into_indexed_tree_40_depth_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	60.9
batch_insert_into_indexed_tree_40_depth_hash_count	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	109
batch_insert_into_indexed_tree_40_depth_hash_ms	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A	0.533

Miscellaneous

Transaction sizes based on how many contract classes are registered in the tx.

Metric	0 registered classes
tx_size_in_bytes	21,991

Transaction processing duration by data writes.

Metric	0 new note hashes	1 new note hashes
tx_pxe_processing_time_ms	3,087 (-1%)	1,645

Metric	0 public data writes	1 public data writes
tx_sequencer_processing_time_ms	10.9 (+2%)	1,148 (-1%)

[github-actions]

Changes to circuit sizes

Generated at commit: 9a63ad784ef7b73faae1815ce0a9275c23e20c8e, compared to commit: 606fdd5617314b62749039ffa7d73843ba352880

🧾 Summary (100% most significant diffs)

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
parity_base	-728 ✅	-60.26%	0 ➖	0.00%
rollup_merge	-160 ✅	-30.89%	0 ➖	0.00%
rollup_root	-160 ✅	-14.65%	0 ➖	0.00%
parity_root	-240 ✅	-33.33%	0 ➖	0.00%
private_kernel_tail	-3 ✅	-0.00%	-3 ✅	-0.00%
public_kernel_tail	-7 ✅	-0.01%	-12 ✅	-0.00%
rollup_base	-54 ✅	-0.03%	-1,105 ✅	-0.06%
private_kernel_init	-113 ✅	-0.23%	-385 ✅	-0.11%
private_kernel_init_simulated	-3 ✅	-0.33%	-6 ✅	-0.33%
private_kernel_inner_simulated	-3 ✅	-0.33%	-6 ✅	-0.33%
private_kernel_inner	-163 ✅	-0.17%	-2,036 ✅	-0.39%
public_kernel_tail_simulated	-5 ✅	-0.55%	-10 ✅	-0.55%
public_kernel_app_logic_simulated	-5 ✅	-0.55%	-10 ✅	-0.55%
public_kernel_setup_simulated	-5 ✅	-0.55%	-10 ✅	-0.55%
public_kernel_teardown_simulated	-5 ✅	-0.55%	-10 ✅	-0.55%
public_kernel_setup	-90 ✅	-0.31%	-1,541 ✅	-0.84%
public_kernel_teardown	-132 ✅	-0.45%	-1,583 ✅	-0.86%
public_kernel_app_logic	-166 ✅	-0.30%	-2,747 ✅	-0.87%
private_kernel_tail_simulated	-5 ✅	-1.10%	-10 ✅	-1.09%
rollup_base_simulated	0 ➖	0.00%	-2 ✅	-5.71%

---

Full diff report 👇

Program	ACIR opcodes (+/-)	%	Circuit size (+/-)	%
parity_base	480 (-728)	-60.26%	79,811 (0)	0.00%
rollup_merge	358 (-160)	-30.89%	45,970 (0)	0.00%
rollup_root	932 (-160)	-14.65%	77,898 (0)	0.00%
parity_root	480 (-240)	-33.33%	79,811 (0)	0.00%
private_kernel_tail	373,474 (-3)	-0.00%	839,580 (-3)	-0.00%
public_kernel_tail	124,962 (-7)	-0.01%	358,953 (-12)	-0.00%
rollup_base	171,461 (-54)	-0.03%	1,730,707 (-1,105)	-0.06%
private_kernel_init	48,594 (-113)	-0.23%	348,606 (-385)	-0.11%
private_kernel_init_simulated	904 (-3)	-0.33%	1,811 (-6)	-0.33%
private_kernel_inner_simulated	904 (-3)	-0.33%	1,811 (-6)	-0.33%
private_kernel_inner	95,835 (-163)	-0.17%	519,409 (-2,036)	-0.39%
public_kernel_tail_simulated	903 (-5)	-0.55%	1,809 (-10)	-0.55%
public_kernel_app_logic_simulated	903 (-5)	-0.55%	1,809 (-10)	-0.55%
public_kernel_setup_simulated	903 (-5)	-0.55%	1,809 (-10)	-0.55%
public_kernel_teardown_simulated	903 (-5)	-0.55%	1,809 (-10)	-0.55%
public_kernel_setup	29,330 (-90)	-0.31%	182,766 (-1,541)	-0.84%
public_kernel_teardown	29,397 (-132)	-0.45%	182,834 (-1,583)	-0.86%
public_kernel_app_logic	56,052 (-166)	-0.30%	314,134 (-2,747)	-0.87%
private_kernel_tail_simulated	451 (-5)	-1.10%	905 (-10)	-1.09%
rollup_base_simulated	1 (0)	0.00%	33 (-2)	-5.71%