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SubjectRe: Terrible elevator performance in kernel 2.4.0-test8
On Thu, 14 Sep 2000, Andrea Arcangeli wrote:
> On Thu, Sep 14, 2000 at 07:40:12PM +1000, Robert Cohen wrote:
>
> > With kernel version 2.4.0-test1-ac22, I saw adequate performance.
>
> In 2.4.0-test1-ac22 there were a latency-driven elevator (the
> one we have now since test2 can't provide good latency anymore).
>
> So if something it should be the other way around, the elevator
> that we have since test2 should provide _better_ throghput and
> _less_ seeks. Thus it can't be the elevator algorithm but maybe
> as Ingo said something in the plugging that broke during the
> test2 changes.

Indeed you're right. The elevator /shouldn't/ be the source
of all these problems. Under very heavy (but regular) IO
loads I'm not seeing the stalls I experience under lighter
IO loads ...

That is bound to be a problem with unplugging.

regards,

Rik
--
"What you're running that piece of shit Gnome?!?!"
-- Miguel de Icaza, UKUUG 2000

http://www.conectiva.com/ http://www.surriel.com/

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