rbl wrote:
> Makes sense so I did the following to test read/write speeds of 1GB in
> 1kB chunks (I am pretty new to Linux)
>
> time dd bs=1K count=1000000 if=/dev/zero of=testdata conv=fdatasync #
> write speed - 1GB total
> sync && echo -n 3 | sudo tee /proc/sys/vm/drop_caches # flush cache
> time dd bs=1K if=testdata of=/dev/null # read speed
>
> And I still get a write speed of 9MB/s and read of 42MB/s
AFAICT LMS does read of "source" data in 32kBytes chunks which should
only improve things compared to 1K.
LMS request chunks of data to fill a player buffer. Playing only starts
when buffer has reached a threshold. The player will indicate underrun
when no data left in buffer to play.
Player has two buffer input for encoded data and output for decoded
data.
>From log below it looks like input buffer is about 2Mbytes (2,093,152)
and output is about (1,764,000).
The input buffer will take about 63 x 32kbyte chunks to fill and it took
LMS from 44:22.13 to 44:22.73 to do it.
So LMS is initially supplying data at about 2,093,152/0.6 =
3.4Mbytes/sec - so something is causing a delay or not letting LMS
service an I/O request.
If you are still running LMS 8.1.2 - it is old (abt Jan 2021) please
upgrade just to eliminate old bugs. IIRC While there have been many bug
fixes, there were some in early 2021 relating to waiting for I/O.
Code:
--------------------
[22-11-09 20:44:22.1310] Slim::Player::Player::_buffering (1144) Buffering...
40960 / 2093152
[22-11-09 20:44:22.1350] Slim::Player::StreamingController::_eventAction
(272) 00:00:00:00:00:00: StatusHeartbeat in BUFFERING-STREAMING ->
Slim::Player::StreamingController::_NoOp
[22-11-09 20:44:22.4319] Slim::Player::Player::_buffering (1144) Buffering...
1212416 / 2093152
[22-11-09 20:44:22.4322] Slim::Player::Player::_buffering (1145) +output...
229376 / 1764000
[22-11-09 20:44:22.4337] Slim::Player::StreamingController::_eventAction
(272) 00:00:00:00:00:00: StatusHeartbeat in BUFFERING-STREAMING ->
Slim::Player::StreamingController::_NoOp
[22-11-09 20:44:22.7330] Slim::Player::Player::_buffering (1144) Buffering...
2097151 / 2093152
[22-11-09 20:44:22.7336] Slim::Player::Player::_buffering (1145) +output...
3342336 / 1764000
[22-11-09 20:44:22.7338] Slim::Player::StreamingController::playerBufferReady
(2278) 00:00:00:00:00:00
--------------------
------------------------------------------------------------------------
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