Skip to content
  • Apollon Oikonomopoulos's avatar
    KVM: Migration bandwidth and downtime control · e43d4f9f
    Apollon Oikonomopoulos authored
    Introduce 2 new hypervisor options, migration_bandwidth and migration_downtime
    and implement KVM migration bandwidth and downtime control.
    migration_bandwidth controls KVM's maximal bandwidth during migration, in
    MiB/s. Default value is 32 MiB/s, same as KVM's internal default. This option
    is a global hypervisor option.
    migration_downtime sets the amount of time (in ms) a KVM instance is allowed to
    freeze while copying memory pages. This is useful when migrating busy guests,
    as KVM's internal default of 30ms is too low for the page-copying algorithm to
    converge. This is a per-instance option, with a default of 30ms, same as KVM's
    internal default.
    Signed-off-by: default avatarApollon Oikonomopoulos <>
    Signed-off-by: default avatarBalazs Lecz <>
    Reviewed-by: default avatarBalazs Lecz <>