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ateom-microvm: Tune guest memory & vCPUs #1724

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ateom-microvm: Tune guest memory & vCPUs#1724
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area/microVMkind/featureAn enhancement / feature request or implementation

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@hdp617
Huy Pham (hdp617)
opened on Sep 17, 2026

Today, we use the defaults from Kata for the guest VM's memory and vCPUs.

substrate/cmd/ateom-microvm/internal/kata/config.go

Lines 24 to 36 in 0109b8e

// KataConfig holds the values ateom reads from a kata configuration.toml. ateom
// owns the cloud-hypervisor boot and points it at the runtime-fetched asset paths
// directly, so the only things it needs from the config are the guest sizing and
// the agent kernel command line.
type KataConfig struct {
// MemoryMiB is the guest RAM size ([hypervisor.clh] default_memory).
MemoryMiB int
// VCPUs is the guest vCPU count ([hypervisor.clh] default_vcpus).
VCPUs int
// KernelParams is the guest kernel command line ([hypervisor.clh]
// kernel_params): the kata-agent parameters (agent.log, the systemd target,
// etc.). ateom appends these to the cloud-hypervisor payload cmdline, since
// there is no kata shim to inject them.

The appropriate values for Substrate are likely lower. This task is to adjust these values for Actors. Also related to #1032.

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