解决linux下alsa dmix CPU占用率

pcm.!default {
    type plug
    slave.pcm "dmixer"
}

pcm.dmixer {
     type dmix
     ipc_key 1024
     slave {
        pcm "hw:0,0"
        period_time 0
        period_size 1024
        buffer_size 4096
        rate 44100
    }
    bindings {
        0 0
        1 1
    }
}

ctl.dmixer {
    type hw
    card 0
}