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SubjectRe: Special Kernel Modification
On November 4, 2001 21:52, you wrote:
> said:
> > > Mounting it synchronous will disable caching in the VM.
> >
> > Who told
> > you that? Synchronous mounting turns off write buffering. Even with
> > "-o sync" writes will still end up in the page cache, they'll just be
> > commited immediately.
> Ummm, how about O_DIRECT instead of O_SYNC (or maybe as well, my googling
> hasn't been clear on whether O_DIRECT bypasses the cache on writes as
> well)?

Nope, last I checked O_DIRECT enforces buffer and file offset alignment.
Normal apps wouldn't work very well at all. Maybe UML needs some hacks around
the whole caching issue?

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