Set firecracker CPU overprovisioning back to 3 for now (#7722)

enterprise/server/remote_execution/containers/firecracker/firecracker.go

@@ -81,7 +81,7 @@ var dieOnFirecrackerFailure = flag.Bool("executor.die_on_firecracker_failure", f
 var workspaceDiskSlackSpaceMB = flag.Int64("executor.firecracker_workspace_disk_slack_space_mb", 2_000, "Extra space to allocate to firecracker workspace disks, in megabytes. ** Experimental **")
 var healthCheckInterval = flag.Duration("executor.firecracker_health_check_interval", 10*time.Second, "How often to run VM health checks while tasks are executing.")
 var healthCheckTimeout = flag.Duration("executor.firecracker_health_check_timeout", 30*time.Second, "Timeout for VM health check requests.")
-var overprovisionCPUs = flag.Int("executor.firecracker_overprovision_cpus", -1, "Number of CPUs to overprovision for VMs. This allows VMs to more effectively utilize CPU resources on the host machine. Set to -1 to allow all VMs to use max CPU.")
+var overprovisionCPUs = flag.Int("executor.firecracker_overprovision_cpus", 3, "Number of CPUs to overprovision for VMs. This allows VMs to more effectively utilize CPU resources on the host machine. Set to -1 to allow all VMs to use max CPU.")
 var initOnAllocAndFree = flag.Bool("executor.firecracker_init_on_alloc_and_free", false, "Set init_on_alloc=1 and init_on_free=1 in firecracker vms")
 
 var forceRemoteSnapshotting = flag.Bool("debug_force_remote_snapshots", false, "When remote snapshotting is enabled, force remote snapshotting even for tasks which otherwise wouldn't support it.")