On September 6, 2001 06:57 pm, Rik van Riel wrote:
> On Thu, 6 Sep 2001, Daniel Phillips wrote:
>
> > Err, not quite the whole story. It is *never* right to leave the disk
> > sitting idle while there are dirty, writable IO buffers.
>
> Define "idle" ?
Idle = not doing anything. IO queue is empty.
> Is idle the time it takes between two readahead requests
> to be issued, delaying the second request because you
> just moved the disk arm away ?
Which two readahead requests? It's idle.
> Is idle when we haven't had a request for, say, 3 disk
> seek time periods ?
See above definition of idle.
> Is idle when we won't be getting any request soon for the
> area where the disk arm is hanging out ? (and how do we
> know the future?)
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This archive was generated by hypermail 2b29 : Fri Sep 07 2001 - 21:00:36 EST