Subject: Re: Limiting disk I/O?
To: Steven M. Bellovin <email@example.com>
From: Michael van Elst <firstname.lastname@example.org>
Date: 11/13/2007 07:40:09
On Tue, Nov 13, 2007 at 12:18:17AM +0000, Steven M. Bellovin wrote:
> On Mon, 12 Nov 2007 20:38:10 +0000 (UTC)
> email@example.com (Michael van Elst) wrote:
> > firstname.lastname@example.org (Jukka Marin) writes:
> > >Wow :-) But I don't think delaying a catastrophe is the same as
> > >preventing it :-) I would like to slow down the sync operation (to
> > >leave part of the I/O capacity for other things). I guess I could
> > >try making the delays real short and see what happens then..
> > The problem comes from running out of buffers. You want to sync
> > often and you want to sync fewer buffers in a burst to mitigate
> > the problem.
> This, I think, is a large part of the actual solution to the problem.
> The other part is to have the process scheduler penalize processes -- or
> users? -- that do too much I/O.
What happened to http://netbsd-soc.sourceforge.net/projects/congest/ ?
Michael van Elst
"A potential Snark may lurk in every tree."