Messages in this thread |  | | From | Ryan Cumming <> | Subject | Re: Special Kernel Modification | Date | Sun, 4 Nov 2001 21:30:38 -0800 |
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On November 4, 2001 21:52, you wrote: > bodnar42@phalynx.dhs.org 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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