Add P2P signalling-only netem benchmark

test/bench-network/README.md

@@ -47,6 +47,10 @@ Available local cases:
 - `p2p-smartphone-vpn-direct`
 - `p2p-user-turn`
 
+Set `BENCH_REPEAT_COUNT` to run each selected case more than once. Repeated
+results are written with suffixes such as `-r01`, `-r02`, and `-r03`, and the
+summary records the repeat index for each run.
+
 `p2p-smartphone-vpn-direct` is a structural case name. When it is run inside
 this Compose package it is not a real smartphone tethering/VPN measurement; it
 uses the local Compose network. Use it only for wiring checks unless the runner
@@ -193,6 +197,41 @@ a unique `BENCH_SPLIT_RUN_ID`:
 docker compose -f test/bench-network/compose.yml --profile p2p-split down --volumes
 ```
 
+## P2P Signalling-Only Emulation
+
+The optional `signalling-shim` profile shapes only the Nostr signalling relay
+path. The P2P host and client run in the benchmark runner as usual, and the
+configured relay URL points at a TCP netem shim in front of `nostr-relay`.
+This is the preferred fixture when evaluating the hypothesis that P2P avoids a
+constrained remote database data path while still depending on a signalling
+server for rendezvous.
+
+```bash
+BENCH_CASES=p2p-signalling-netem-home-wifi \
+docker compose -f test/bench-network/compose.yml --profile signalling-shim run --rm \
+  bench-runner-signalling-shim
+```
+
+For a stricter signalling path:
+
+```bash
+NETEM_PROFILE=tethering-vpn \
+NETEM_DELAY_MS=140 \
+NETEM_JITTER_MS=50 \
+NETEM_LOSS_PERCENT=1.0 \
+NETEM_BANDWIDTH_MBIT=10 \
+NETEM_MTU=1380 \
+BENCH_CASES=p2p-signalling-netem-tethering-vpn \
+docker compose -f test/bench-network/compose.yml --profile signalling-shim run --rm \
+  bench-runner-signalling-shim
+```
+
+Use this separately from `p2p-split`. The `p2p-split` profile shapes each peer's
+egress path, so it constrains both signalling and the selected WebRTC data
+path. The `signalling-shim` profile constrains only relay access, which keeps
+it focused on peer-to-signalling-server reachability rather than peer-to-peer
+note-data transfer.
+
 ## Shimmed CouchDB benchmark
 
 The optional `shim` profile runs a CouchDB benchmark through a TCP forwarding

test/bench-network/compose.yml

@@ -73,6 +73,7 @@ services:
     environment:
       BENCH_COMMAND: ${BENCH_COMMAND:-cases}
       BENCH_CASES: ${BENCH_CASES:-couchdb-baseline,p2p-direct-local}
+      BENCH_REPEAT_COUNT: ${BENCH_REPEAT_COUNT:-1}
       BENCH_CASES_ROOT: /workspace/src/apps/cli/testdeno/bench-results
       BENCH_SWEEP_ROOT: /workspace/src/apps/cli/testdeno/bench-results
       BENCH_SWEEP_RTT_MS: ${BENCH_SWEEP_RTT_MS:-20,50,100,150,300}
@@ -141,6 +142,7 @@ services:
     environment:
       BENCH_COMMAND: ${BENCH_COMMAND:-cases}
       BENCH_CASES: ${BENCH_CASES:-couchdb-netem-home-wifi}
+      BENCH_REPEAT_COUNT: ${BENCH_REPEAT_COUNT:-1}
       BENCH_CASES_ROOT: /workspace/src/apps/cli/testdeno/bench-results
       BENCH_SWEEP_ROOT: /workspace/src/apps/cli/testdeno/bench-results
       BENCH_COUCHDB_MANAGED: "false"
@@ -160,6 +162,64 @@ services:
     volumes:
       - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
 
+  p2p-signalling-shim:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.shim
+    profiles:
+      - signalling-shim
+    depends_on:
+      nostr-relay:
+        condition: service_healthy
+    cap_add:
+      - NET_ADMIN
+    environment:
+      NETEM_PROFILE: ${NETEM_PROFILE:-home-wifi}
+      NETEM_INTERFACE: ${NETEM_INTERFACE:-eth0}
+      NETEM_DELAY_MS: ${NETEM_DELAY_MS:-20}
+      NETEM_JITTER_MS: ${NETEM_JITTER_MS:-5}
+      NETEM_LOSS_PERCENT: ${NETEM_LOSS_PERCENT:-0.1}
+      NETEM_BANDWIDTH_MBIT: ${NETEM_BANDWIDTH_MBIT:-100}
+      NETEM_MTU: ${NETEM_MTU:-1500}
+      NETEM_RESULT_ROOT: /bench-results
+      SHIM_LISTEN_PORT: 7777
+      SHIM_TARGET_HOST: nostr-relay
+      SHIM_TARGET_PORT: 7777
+    volumes:
+      - ./bench-results:/bench-results
+    healthcheck:
+      test: ["CMD-SHELL", "nc -z 127.0.0.1 7777"]
+      interval: 2s
+      timeout: 5s
+      retries: 30
+
+  bench-runner-signalling-shim:
+    build:
+      context: ../..
+      dockerfile: test/bench-network/Dockerfile.runner
+    profiles:
+      - signalling-shim
+    depends_on:
+      p2p-signalling-shim:
+        condition: service_healthy
+    environment:
+      BENCH_COMMAND: ${BENCH_COMMAND:-cases}
+      BENCH_CASES: ${BENCH_CASES:-p2p-signalling-netem-home-wifi}
+      BENCH_REPEAT_COUNT: ${BENCH_REPEAT_COUNT:-1}
+      BENCH_CASES_ROOT: /workspace/src/apps/cli/testdeno/bench-results
+      BENCH_SIGNAL_SHIM_RELAY: ws://p2p-signalling-shim:7777/
+      BENCH_MD_FILE_COUNT: ${BENCH_MD_FILE_COUNT:-20}
+      BENCH_MD_MIN_SIZE_BYTES: ${BENCH_MD_MIN_SIZE_BYTES:-512}
+      BENCH_MD_MAX_SIZE_BYTES: ${BENCH_MD_MAX_SIZE_BYTES:-2048}
+      BENCH_BIN_FILE_COUNT: ${BENCH_BIN_FILE_COUNT:-5}
+      BENCH_BIN_SIZE_BYTES: ${BENCH_BIN_SIZE_BYTES:-8192}
+      BENCH_SYNC_TIMEOUT: ${BENCH_SYNC_TIMEOUT:-300}
+      BENCH_PEERS_TIMEOUT: ${BENCH_PEERS_TIMEOUT:-60}
+      LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS: ${LIVESYNC_P2P_RELAY_READY_TIMEOUT_MS:-60000}
+      BENCH_LIVESYNC_TEST_TEE: ${BENCH_LIVESYNC_TEST_TEE:-0}
+    volumes:
+      - ./bench-results:/workspace/src/apps/cli/testdeno/bench-results
+
   p2p-split-host:
     build:
       context: ../..