what is the smallest buffer size which aplay without underrun ? 1024,512,256,128,64,...


aplay -D front:CARD=CA0106 -v --buffer-size=1024 stereo48000.wav


19:29:42 homecomp pulseaudio[1911]: Protocol version: remote 26, local 29
Dec 25 19:29:42 homecomp pulseaudio[1911]: Got credentials: uid=1000 gid=1000 success=1
Dec 25 19:29:42 homecomp pulseaudio[1911]: SHM possible: yes
Dec 25 19:29:42 homecomp pulseaudio[1911]: Negotiated SHM: yes
Dec 25 19:29:42 homecomp pulseaudio[1911]: Looking for .desktop file for Transistor.bin.x86_64
Dec 25 19:29:42 homecomp pulseaudio[1911]: Not setting device for stream ALSA Playback, because it lacks role.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Negotiated format: pcm, format.sample_format = "\"s16le\""  format.rate = "48000"  format.channels = "2"  format.channel_map = "\"front-left,front-right\""
Dec 25 19:29:42 homecomp pulseaudio[1911]: Sink alsa_output.pci-0000_06_00.0.analog-stereo becomes busy, resuming.
Dec 25 19:29:42 homecomp pulseaudio[1911]: memblockq requested: maxlength=33554432, tlength=0, base=4, prebuf=0, minreq=1 maxrewind=0
Dec 25 19:29:42 homecomp pulseaudio[1911]: memblockq sanitized: maxlength=33554432, tlength=33554432, base=4, prebuf=0, minreq=4 maxrewind=0
Dec 25 19:29:42 homecomp pulseaudio[1911]: Created input 15 "ALSA Playback" on alsa_output.pci-0000_06_00.0.analog-stereo with sample spec s16le 2ch 48000Hz and channel map front-left,front-right
Dec 25 19:29:42 homecomp pulseaudio[1911]:     media.name = "ALSA Playback"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.name = "ALSA plug-in [Transistor.bin.x86_64]"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     native-protocol.peer = "UNIX socket client"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     native-protocol.version = "26"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.process.id = "9536"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.process.user = "rkfg"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.process.host = "homecomp"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.process.binary = "Transistor.bin.x86_64"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.language = "en_GB.UTF-8"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     window.x11.display = ":0.0"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.process.machine_id = "3be8f38f291dd2003af500d051c0a849"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     application.process.session_id = "10"
Dec 25 19:29:42 homecomp pulseaudio[1911]:     module-stream-restore.id = "sink-input-by-application-name:ALSA plug-in [Transistor.bin.x86_64]"
Dec 25 19:29:42 homecomp pulseaudio[1911]: Requested tlength=85.33 ms, minreq=21.33 ms
Dec 25 19:29:42 homecomp pulseaudio[1911]: Early requests mode enabled, configuring sink latency to minreq.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Requested latency=21.33 ms, Received latency=26.00 ms
Dec 25 19:29:42 homecomp pulseaudio[1911]: memblockq requested: maxlength=4194304, tlength=16384, base=4, prebuf=11396, minreq=4992 maxrewind=0
Dec 25 19:29:42 homecomp pulseaudio[1911]: memblockq sanitized: maxlength=4194304, tlength=16384, base=4, prebuf=11396, minreq=4992 maxrewind=0
Dec 25 19:29:42 homecomp pulseaudio[1911]: Final latency 111.33 ms = 33.33 ms + 2*26.00 ms + 26.00 ms
Dec 25 19:29:42 homecomp pulseaudio[1911]: Latency set to 26.00ms
Dec 25 19:29:42 homecomp pulseaudio[1911]: hwbuf_unused=60544
Dec 25 19:29:42 homecomp pulseaudio[1911]: setting avail_min=15617
Dec 25 19:29:42 homecomp pulseaudio[1911]: Requested volume: front-left: 52559 /  80% / -5.75 dB,   front-right: 52559 /  80% / -5.75 dB
Dec 25 19:29:42 homecomp pulseaudio[1911]: Got hardware volume: front-left: 53066 /  81% / -5.50 dB,   front-right: 53066 /  81% / -5.50 dB
Dec 25 19:29:42 homecomp pulseaudio[1911]: Calculated software volume: front-left: 64910 /  99% / -0.25 dB,   front-right: 64910 /  99% / -0.25 dB (accurate-enough=yes)
Dec 25 19:29:42 homecomp pulseaudio[1911]: Volume not changing
Dec 25 19:29:42 homecomp pulseaudio[1911]: Requesting rewind due to end of underrun.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Requested to rewind 65536 bytes.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Limited to 3904 bytes.
Dec 25 19:29:42 homecomp pulseaudio[1911]: before: 976
Dec 25 19:29:42 homecomp pulseaudio[1911]: after: 976
Dec 25 19:29:42 homecomp pulseaudio[1911]: Rewound 3904 bytes.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Processing rewind...
Dec 25 19:29:42 homecomp pulseaudio[1911]: latency = 65877
Dec 25 19:29:42 homecomp pulseaudio[1911]: Have to rewind 3904 bytes on render memblockq.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Have to rewind 3904 bytes on render memblockq.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Have to rewind 3904 bytes on render memblockq.
Dec 25 19:29:42 homecomp pulseaudio[1911]: Processing rewind...
Dec 25 19:29:42 homecomp pulseaudio[1911]: Wakeup from ALSA!
Dec 25 19:29:42 homecomp pulseaudio[1911]: Wakeup from ALSA!
Dec 25 19:29:42 homecomp pulseaudio[1911]: Wakeup from ALSA!
Dec 25 19:30:19 homecomp pulseaudio[1911]: Requesting rewind due to corking
Dec 25 19:30:19 homecomp pulseaudio[1911]: Requested to rewind 65536 bytes.
Dec 25 19:30:19 homecomp pulseaudio[1911]: Limited to 4544 bytes.
Dec 25 19:30:19 homecomp pulseaudio[1911]: before: 1136
Dec 25 19:30:19 homecomp pulseaudio[1911]: after: 1136
Dec 25 19:30:19 homecomp pulseaudio[1911]: Rewound 4544 bytes.
Dec 25 19:30:19 homecomp pulseaudio[1911]: Processing rewind...
Dec 25 19:30:19 homecomp pulseaudio[1911]: latency = 1234
Dec 25 19:30:19 homecomp pulseaudio[1911]: Have to rewind 4544 bytes on render memblockq.
Dec 25 19:30:19 homecomp pulseaudio[1911]: Have to rewind 4544 bytes on render memblockq.
Dec 25 19:30:19 homecomp pulseaudio[1911]: Have to rewind 4544 bytes on render memblockq.
Dec 25 19:30:19 homecomp pulseaudio[1911]: Have to rewind 4544 bytes on implementor.
Dec 25 19:30:19 homecomp pulseaudio[1911]: Processing rewind...
Dec 25 19:30:19 homecomp pulseaudio[1911]: Found underrun 4864 bytes ago (128 bytes ahead in playback buffer)
Dec 25 19:30:19 homecomp pulseaudio[1911]: Found underrun 4864 bytes ago (64 bytes ahead in playback buffer)
Dec 25 19:30:19 homecomp pulseaudio[1911]: Latency set to 26.00ms
Dec 25 19:30:19 homecomp pulseaudio[1911]: hwbuf_unused=60544
Dec 25 19:30:19 homecomp pulseaudio[1911]: setting avail_min=15617