Re: open(.. O_DIRECT ..) difference in between Linux and FreeBSD ..

[Arjan van de Ven]

On Fri, Jun 13, 2003 at 10:27:52AM +0200, Rob van Nieuwkerk wrote:
> 
> Arjan van de Ven wrote:
> > On Fri, Jun 13, 2003 at 01:12:57AM +0200, Rob van Nieuwkerk wrote:
> > > FYI:
> > > It appears that somewhere between RH kernels 2.4.18-27.7.x and 2.4.20-18.9
> > > something has changed so that my application needs a O_SYNC too besides
> > > the O_DIRECT to make sure that writes will be synchronous.  If I leave
> > > the O_SYNC out with 2.4.20-18.9 the write will happen physically 35
> > > seconds after the write() was done.
> > 
> > O_DIRECT is nothing but a hint and the 2.4.20-18.9 kernel decides to not
> > honor it
> 
> Hi Arjan,
> 
> Do you mean that the 2.4.20-18.9 kernel always ignores the O_DIRECT flag ?

yes.