Development Update — August 25

The throughput day. A single-line change — raising the yamux stream window from 256 KB to 16 MB for the mesh’s bandwidth-delay product — turns out to be the throughput fix the mux work had been circling: the mesh was window-starved, not CPU- or mux-bound. It lands next to a multi-tunnel aggregation foundation, an adaptive mux that finally converges to the fastest legs in one tick, sharded CXO feeds that let a busy hub’s Root fill, and a large package reorganization grouping the deployment services under pkg/deployment.

Skywire: The Window Was the Bottleneck

4211 raises the yamux stream window from 256 KB to 16 MB to match the mesh’s bandwidth-delay product. A mesh route has a far larger BDP than a LAN, so a 256 KB window let only a fraction of the pipe fill before the sender stalled waiting for ACKs — the link was window-starved, and no amount of mux width could recover throughput a single window cap was throttling. 4210 fixes the companion bug: a yamux stream now returns an error instead of spinning when its session is shut down mid-read. 4212 is the RFC framing the next step — mesh bandwidth aggregation via connection-striped independent flows.

Skywire: Multi-Tunnel Aggregation

4213 lays the foundation: a multi-session skysocks client that stripes across the least-loaded connection. 4214 auto-diversifies the multi-tunnel dials over disjoint first-hop transports so the tunnels take genuinely independent paths, 4215 exposes --tunnels on proxy start to drive the aggregation, and 4216 re-dials dead multi-tunnels and diversifies sequentially and reliably.

Skywire: Adaptive Mux That Converges

A run of router fixes makes the adaptive mux both fast to serve and quick to settle. 4209 establishes mux legs asynchronously so a dial serves on its primary immediately instead of waiting for the whole group, 4207 adds instant warm-standby failover so a leg’s death never dead-ends a connection, and 4208 swaps out a sustained-bad primary leg instead of riding it forever. 4200 converges the mux to the fastest N legs in a single tick, 4201 has the adaptive tick evict low-throughput legs rather than only dead ones, and 4206 caps the adaptive active mux at adaptCap even under load. The warm-standby pool is uncapped in stages — 4193 raises adaptStandbyMax from 2 to 60, 4202 truly uncaps it and fills it in the background, and 4187 makes the adaptive mux symmetric and bidirectional so the pool actually fills — and 4177 exempts control-plane ports from the routing policy by default.

Skywire: Sharded CXO Feeds

To let a busy hub’s Root fill at all, the large CXO feeds are sharded to one leaf per unit. 4190 shards the telemetry feed into compact-binary leaves, 4195 shards the services feed to one leaf per type, 4191 batches the dmsgd clients-by-server feed to one leaf per server, and 4170 caches the expired-transport SCAN so the TPD metrics publisher stops re-SCANning redis every tick. 4179 resets the fill stall timer on progress and adds a hard total ceiling. The attempt to consolidate the tp-list onto the telemetry feed (#4171, #4184) is reverted twice (4174, 4189) after it regressed the fill — the dedicated feed from the day before stays.

Skywire: Deployment Services Over CXO

4186 resolves dmsg entries over CXO through the clients-by-server feed with an HTTP fallback, and 4175 binds address-resolver registration over CXO as an additive dual-write. 4172 allocates the CXO ports for the AR-bind and SD-registration feeds, and 4173 moves them off a collision (68→71, 70→72). 4182 removes a pre-transport dmsg reachability probe from autoconnect.

Skywire: Package Reorg, the Route Tree, and the CLI

A three-batch reorganization groups related packages: 4180 gathers stray packages under their parents, 4181 groups the deployment-service servers under pkg/deployment, and 4185 moves transport-discovery under pkg/deployment/tpd. The proxy status route tree gets a visual pass — 4205 colors the exit red and each hop level distinctly, 4203 fixes leg-metric widths so the tree doesn’t shift on update, 4197 and 4199 full-bleed and center it, 4192 is a layout pass with header bandwidth meters and a resizable log pane, and 4188 restores the bilateral tree — and 4204 and 4198 always serve status.skysocks in-process, even when disconnected from the exit, never the interstitial. On the CLI, 4194 adds a server-side transport-summary endpoint so tp -s need not fetch every transport, 4196 moves the network transport summary onto tp disc -s, and 4176 honors --json/--jq/--shape on rg, skychat alias/pair list and visor reward. 4178 rebuilds the committed wasmgo blob from a clean tree.