[JensRantil]

I used to work at a VOIP provider where users started reporting choppy audio. After a week or two we nailed it down to customers that had "call recording" feature enabled. Essentially their calls were being recorded and streamed to an audio file to be accessed later through a web interface. After yet another week of investigations we noticed that disk IO was fairly high on machines that had big customers with call recording enabled for all their endpoints. We drilled the IO issues down to the WAV file format that has a header that needs to be updated for every write to accomodate for the updated length of the recording. This required a lot of disk seeks on spinning disks and unfortunately file flushing could not be disabled.. Switching to a RAW audio format that we post-processed after the call resolved the issue.