Yusuf Goolamabbas <yusufg@outblaze.com> writes:
> Bruce, haven't followed the thread completely. Accessing the web archive
> is slow from Hong Kong but I just wanted to point you to this lkml post
> which shows why O_SYNC is much faster than fsync (at least on ext3)
> http://marc.theaimsgroup.com/?l=linux-kernel&m=107959907410443&w=2
That patch is broken on its face. If O_SYNC doesn't take longer than
O_DSYNC, and likewise fsync longer than fdatasync, then the Unix
filesystem semantics are not being honored because the file mod time
isn't being updated.
regards, tom lane