enricobuehler
c2ae40ef9e
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The Mac/iOS client's wall around ~380 Mbps on a 2.5 G path is the receive drain, not the transport: a loopback speed-test pushes 380/600/1000 Mbps at 0.0% loss, but Darwin has no recvmmsg(2), so the macOS client was doing one recv() syscall per packet — ~40-90k syscalls/s on one core. When the recv loop can't drain fast enough the kernel socket buffer backs up and drops, which the client sees as a sustained stream stalling/freezing in the 300-400 Mbps range (and an immediate "session ended" when a 500 Mbps+ first keyframe bursts in). - core/transport: flip recvmsg_x (the batched Darwin recv, ~30x fewer syscalls) from opt-in to default ON, opt-out via PUNKTFUNK_RECVMSG_X=0. Keeps the auto-fallback to the scalar loop on any unexpected syscall error. The Apple CI swift-test loopback now exercises this path by default. - packaging/kde host.env: enable PUNKTFUNK_GSO=1 — UDP segmentation offload on the host send path (one sendmsg per ~64 packets), the dominant lever above ~1 Gbps. Already wired (send_sealed -> send_gso) with sendmmsg auto-fallback. - apple SpeedTestSheet: lengthen the bandwidth probe 2 s -> 5 s so the measured number stops swinging wildly (50 vs 900 Mbps on the same link) — long enough for steady-state send + recv drain to settle. Matches host MAX_PROBE_MS. - host capture: PUNKTFUNK_SYNTH_NOISE synthetic high-entropy source for reproducible throughput testing of the encode->FEC->send->recv path. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
24 lines
1.5 KiB
Bash
24 lines
1.5 KiB
Bash
# punktfunk host config for a Fedora/Ubuntu KDE Plasma appliance (kwin backend).
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# Copy to ~/.config/punktfunk/host.env. Pairs with punktfunk-kde-session.service, which brings
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# up a headless `kwin --virtual` on wayland-kde (with KWIN_WAYLAND_NO_PERMISSION_CHECKS=1 so the
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# host can bind KWin's privileged zkde_screencast protocol — an interactive Plasma session will
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# NOT hand that protocol to an external client). The host streams a per-client virtual output
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# from that session, captured zero-copy (dmabuf -> CUDA -> NVENC) on NVIDIA.
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WAYLAND_DISPLAY=wayland-kde
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XDG_CURRENT_DESKTOP=KDE
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PUNKTFUNK_COMPOSITOR=kwin
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PUNKTFUNK_VIDEO_SOURCE=virtual
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PUNKTFUNK_ZEROCOPY=1
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PUNKTFUNK_INPUT_BACKEND=libei
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# UDP Generic Segmentation Offload on the send path: coalesce a frame's equal-size packets into
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# kernel super-buffers (one sendmsg per ~64 packets instead of one per packet) — the dominant
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# lever above ~1 Gbps, where per-packet send syscalls/pps become the host bottleneck. Safe: it
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# auto-falls back to sendmmsg on any kernel/path that rejects UDP_SEGMENT. Set PUNKTFUNK_GSO=0 to
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# force it off if a NIC/middlebox mishandles GSO segments.
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PUNKTFUNK_GSO=1
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# Make the per-session streamed output the SOLE desktop, so plasmashell + windows render on it
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# rather than on the headless session's `kwin --virtual` bootstrap output (without this the client
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# sees only the wallpaper of an empty extended output). KWin re-homes the desktop; the bootstrap is
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# re-enabled on teardown.
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PUNKTFUNK_KWIN_VIRTUAL_PRIMARY=1
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