Messages in this thread | | | Date | Tue, 6 Mar 2001 10:44:34 -0800 (PST) | From | Linus Torvalds <> |
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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).
Linus
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