but at 44100Hz the latency is no exactly 8 ms * 4 = 32ms

how do pa get these values 31.85ms and 31.93ms ?

current latency: 31.85 ms
  max request: 5 KiB
  max rewind: 5 KiB
  monitor source: 0
  sample spec: s16le 2ch 44100Hz
  channel map: front-left,front-right
               Stereo
  used by: 1
  linked by: 1
  fixed latency: 31.93 ms
  card: 0 <alsa_card.pci-0000_00_1b.0>
  module: 4
  properties:
   alsa.resolution_bits = "16"
   device.api = "alsa"
   device.class = "sound"
   alsa.class = "generic"
   alsa.subclass = "generic-mix"
   alsa.name = "ALC889 Analog"
   alsa.id = "ALC889 Analog"
   alsa.subdevice = "0"
   alsa.subdevice_name = "subdevice #0"
   alsa.device = "0"
   alsa.card = "0"
   alsa.card_name = "HDA Intel"
   alsa.long_card_name = "HDA Intel at 0xf3120000 irq 50"
   alsa.driver_name = "snd_hda_intel"
   device.bus_path = "pci-0000:00:1b.0"
   sysfs.path = "/devices/pci0000:00/0000:00:1b.0/sound/card0"
   device.bus = "pci"
   device.vendor.id = "8086"
   device.vendor.name = "Intel Corporation"
   device.product.name = "5 Series/3400 Series Chipset High Definition Audio"
   device.form_factor = "internal"
   device.string = "front:0"
   device.buffering.buffer_size = "5632"
   device.buffering.fragment_size = "704"

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https://bugs.launchpad.net/bugs/996906

Title:
  periodic audio skips with Intel HDA

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