How much control does a block driver have over the buffer cache?

[Mulyadi Santosa]

On Wed, Jul 13, 2011 at 07:30, Neil Baylis <neil.baylis at gmail.com> wrote:
> For example, would it be possible to create a block driver that does not use
> the buffer cache? I think the answer must be 'no' because the caching
> happens before the block driver gets any requests to move data.


something like dd iflag=direct or oflag=direct does?

btw, you are still under effect of hardware cache installed in the
hard disk itself...so what you see is actually IMHO a cumulative
effect of caching happen in the entire system

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
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