Re: 2.6.13-mm3

[Nick Piggin]

Andrew Walrond wrote:
> On Monday 12 September 2005 10:43, Andrew Morton wrote:
>
>
> >  - An update to the anticipatory scheduler to fix a performance problem
> >    where processes do a single read then exit, in the presence of
> > competing I/O acticity.
>
>
> Is there more discussion on this somewhere? When was the problem introduced? 
> Bit of a long shot, but it fits the description of some problems I have 
> noticed recently.

It has been quite a while coming. The problem has been there for a long
time, but there is no "regression" that would not exist in eg. deadline
scheduler.

Basically it used to "miss" opportunities to do read anticipation where it
should pay off, and now it misses less.

A description of / pointer to your problems would be interesting.

Nick

--
SUSE Labs, Novell Inc.

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