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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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4
internal/runtimebundle/bundle.go
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@ -38,6 +38,7 @@ type BundleMetadata struct {
DefaultPackages string `json:"default_packages_file" toml:"default_packages_file"`
DefaultRootfs string `json:"default_rootfs" toml:"default_rootfs"`
DefaultBaseRootfs string `json:"default_base_rootfs,omitempty" toml:"default_base_rootfs"`
DefaultWorkSeed string `json:"default_work_seed,omitempty" toml:"default_work_seed"`
DefaultKernel string `json:"default_kernel" toml:"default_kernel"`
DefaultInitrd string `json:"default_initrd,omitempty" toml:"default_initrd"`
DefaultModulesDir string `json:"default_modules_dir,omitempty" toml:"default_modules_dir"`
@ -233,6 +234,7 @@ func validateBundleMetadata(runtimeDir string, meta BundleMetadata) error {
{meta.DefaultPackages, "default_packages_file", true},
{meta.DefaultRootfs, "default_rootfs", true},
{meta.DefaultBaseRootfs, "default_base_rootfs", false},
{meta.DefaultWorkSeed, "default_work_seed", false},
{meta.DefaultKernel, "default_kernel", true},
{meta.DefaultInitrd, "default_initrd", false},
{meta.DefaultModulesDir, "default_modules_dir", false},
@ -271,6 +273,7 @@ func metadataArchiveBytes(runtimeDir string, meta BundleMetadata) ([]byte, error
strings.TrimSpace(meta.DefaultPackages) == "" &&
strings.TrimSpace(meta.DefaultRootfs) == "" &&
strings.TrimSpace(meta.DefaultBaseRootfs) == "" &&
strings.TrimSpace(meta.DefaultWorkSeed) == "" &&
strings.TrimSpace(meta.DefaultKernel) == "" &&
strings.TrimSpace(meta.DefaultInitrd) == "" &&
strings.TrimSpace(meta.DefaultModulesDir) == "" {
@ -291,6 +294,7 @@ func normalizeBundleMetadata(meta BundleMetadata) BundleMetadata {
meta.DefaultPackages = strings.TrimSpace(meta.DefaultPackages)
meta.DefaultRootfs = strings.TrimSpace(meta.DefaultRootfs)
meta.DefaultBaseRootfs = strings.TrimSpace(meta.DefaultBaseRootfs)
meta.DefaultWorkSeed = strings.TrimSpace(meta.DefaultWorkSeed)
meta.DefaultKernel = strings.TrimSpace(meta.DefaultKernel)
meta.DefaultInitrd = strings.TrimSpace(meta.DefaultInitrd)
meta.DefaultModulesDir = strings.TrimSpace(meta.DefaultModulesDir)