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Speed up VM create with work seeds

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Beat VM create wall time without changing VM semantics.

Generate a work-seed ext4 sidecar during image builds and rootfs rebuilds, then clone and resize that seed for each new VM instead of rebuilding /root from scratch. Plumb the new seed artifact through config, runtime metadata, store state, runtime-bundle defaults, doctor checks, and default-image reconciliation so older images still fall back cleanly.

Add a daemon TAP pool to keep idle bridge-attached devices warm, expose stage timing in lifecycle logs, add a create/SSH benchmark script plus Make target, and teach verify.sh that tap-pool-* devices are reusable capacity rather than cleanup leaks.

Validated with go test ./..., make build, ./verify.sh, and make bench-create ARGS="--runs 2".
This commit is contained in:
Thales Maciel 2026-03-18 21:22:12 -03:00
parent a14a80fd6b
commit c8d9a122f9
No known key found for this signature in database
GPG key ID: 33112E6833C34679
24 changed files with 695 additions and 44 deletions
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8
Makefile
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@ -16,13 +16,13 @@ RUNTIME_HELPERS := $(RUNTIME_SOURCE_DIR)/banger-vsock-pingd
GO_SOURCES := $(shell find cmd internal -type f -name '*.go' | sort)
RUNTIME_EXECUTABLES := firecracker customize.sh packages.sh namegen banger-vsock-pingd
RUNTIME_DATA_FILES := packages.apt id_ed25519 rootfs-docker.ext4
RUNTIME_OPTIONAL_DATA_FILES := rootfs.ext4 bundle.json
RUNTIME_OPTIONAL_DATA_FILES := rootfs.ext4 rootfs-docker.work-seed.ext4 bundle.json
RUNTIME_BOOT_FILES := wtf/root/boot/vmlinux-6.8.0-94-generic wtf/root/boot/initrd.img-6.8.0-94-generic
RUNTIME_MODULES_DIR := wtf/root/lib/modules/6.8.0-94-generic
.DEFAULT_GOAL := help
.PHONY: help build banger bangerd test fmt tidy clean rootfs install runtime-bundle runtime-package check-runtime
.PHONY: help build banger bangerd test fmt tidy clean rootfs install runtime-bundle runtime-package check-runtime bench-create
help:
@printf '%s\n' \
@ -30,6 +30,7 @@ help:
' make build Build ./banger and ./bangerd' \
' make runtime-bundle Fetch and unpack ./runtime from the archive referenced by $(RUNTIME_MANIFEST)' \
' make runtime-package Package $(RUNTIME_SOURCE_DIR) into $(RUNTIME_ARCHIVE) and print its SHA256' \
' make bench-create Benchmark vm create and SSH readiness with scripts/bench-create.sh' \
' make install Build and install binaries plus the runtime bundle into $(DESTDIR)$(BINDIR) and $(DESTDIR)$(RUNTIMEDIR)' \
' make test Run go test ./...' \
' make fmt Format Go sources under cmd/ and internal/' \
@ -67,6 +68,9 @@ runtime-bundle:
runtime-package:
$(GO) run ./cmd/runtimebundle package --manifest "$(RUNTIME_MANIFEST)" --runtime-dir "$(RUNTIME_SOURCE_DIR)" --out "$(RUNTIME_ARCHIVE)"
bench-create: build
bash ./scripts/bench-create.sh $(ARGS)
check-runtime:
@test -d "$(RUNTIME_SOURCE_DIR)" || { echo "missing runtime bundle directory: $(RUNTIME_SOURCE_DIR); run 'make runtime-bundle'" >&2; exit 1; }
@for path in $(RUNTIME_EXECUTABLES) $(RUNTIME_DATA_FILES) $(RUNTIME_BOOT_FILES) $(RUNTIME_MODULES_DIR); do \