"read_timer_interval(%u), output(%s)",
$self->overwrite, $self->subbuf_size, $self->num_subbuf,
$self->switch_timer_interval, $self->read_timer_interval,
"read_timer_interval(%u), output(%s)",
$self->overwrite, $self->subbuf_size, $self->num_subbuf,
$self->switch_timer_interval, $self->read_timer_interval,