Re: Why is fsync so much slower than O_SYNC?

[Jeffrey Siegal]

Some odd results on ext2 as well:

README: Make sure you have turned off hardware write caching (hdparm -W0 
/dev/hda for IDE)

O_SYNC:
Creating
Starting
iter = 1000, latency = 8.419908ms

O_DSYNC:
Creating
Starting
iter = 1000, latency = 8.369892ms

fsync:
Creating
Starting
iter = 1000, latency = 13.191030ms

fdatasync:
Creating
Starting
iter = 1000, latency = 8.829373ms

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