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Linus Torvalds himself wrote : > On Tue, 6 Mar 2001, Alan Cox wrote: > > > > > > I don't know if there is any way to turn of a write buffer on an IDE disk. > > > You want a forced set of commands to kill caching at init? > > > > Wrong model > > > > You want a write barrier. Write buffering (at least for short intervals) in > > the drive is very sensible. The kernel needs to able to send drivers a write > > barrier which will not be completed with outstanding commands before the > > barrier. > > Agreed. > > Write buffering is incredibly useful on a disk - for all the same reasons > that an OS wants to do it. The disk can use write buffering to speed up > writes a lot - not just lower the _perceived_ latency by the OS, but to > actually improve performance too. > > But Alan is right - we needs a "sync" command or something. I don't know > if IDE has one (it already might, for all I know). ATA , SCSI and ATAPI all have a FLUSH_CACHE command. (*) Whether the drives implement it is another question ... (*) references : ATA-6 draft standard from www.t13.org MtFuji document from ???????? -- David Balazic -------------- "Be excellent to each other." - Bill & Ted - - - - - - - - - - - - - - - - - - - - - - - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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