Messages in this thread |  | | From | Daniel Phillips <> | Subject | Re: page_launder() on 2.4.9/10 issue | Date | Thu, 6 Sep 2001 19:22:53 +0200 |
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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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