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SubjectRe: page_launder() on 2.4.9/10 issue
Date
On September 6, 2001 03:18 pm, Kurt Garloff wrote:
> On Thu, Sep 06, 2001 at 10:03:03AM -0300, Rik van Riel wrote:
> > On Thu, 6 Sep 2001, Daniel Phillips wrote:
> > > On September 6, 2001 02:32 pm, Rik van Riel wrote:
> > > > Two words: "IO clustering".
> > >
> > > Yes, *after* the IO queue is fully loaded that makes sense. Leaving it
> > > partly or fully idle while waiting for it to load up makes no sense at
all.
> > >
> > > IO clustering will happen naturally after the queue loads up.
> >
> > Exactly, so we need to give the queue some time to load
> > up, right ?
>
> Just use two limits:
> * Time: After some time (say two seconds), we can always afford to write it
> out
> * Queue filling: After it has a certain size, it's worth doing a writing.

Err, not quite the whole story. It is *never* right to leave the disk
sitting idle while there are dirty, writable IO buffers.

--
Daniel
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