#10045 HIGH 1.5-sof: XO-1.5 Record audio/video are out of sync with each other

John Watlington wad at laptop.org
Tue May 11 19:30:15 EDT 2010

On May 11, 2010, at 7:24 PM, James Cameron wrote:

> On Tue, May 11, 2010 at 07:14:53PM -0400, John Watlington wrote:
>> Writes in UNIX are typically asynchronous --- get the data into a memory
>> buffer and the program can continue along its merry way.
>> I strongly suspect that writes through the SD system are forced to wait
>> for the media to complete the write.
> My tests show that our kernel is doing this for USB and SD, on ext2,
> ext3, ext4, vfat, and raw access to the block device (open ... write ...
> write ... close).  It isn't doing it for writes to tmpfs or null.

Are sync writes forced on removable media ?


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