Re: [PATCH RFC] 1/2 central workspace for zlib

Con Kolivas
2003-05-31T08:20:25Z

On Sat, 31 May 2003 17:56, Jörn Engel wrote:
> CC List pruned a little.
>
> On Fri, 30 May 2003 23:55:05 -0700, David S. Miller wrote:
> > From: Jörn Engel <joern@wohnheim.fh-wedel.de>
> >
> > How about preemption? zlib operations take their time, so at least on
> > up, it makes sense to preempt them, when not in softirq context. Can
> > this still be done lockless?
> >
> > You'll need to disable preemption.
>
> My gut feeling claims that this would hurt interactivity. Con, would
> contest on a jffs2 (zlib compressed) filesystem be able to show
> interactivity problems wrt zlib?

The only way I could think of was perhaps using a load on another disk
(io_other which is in contest) that is using jffs2 when the contest baseline
is running on a normal filesystem - this has shown very little differences
between filesystems normally. Otherwise if everything in contest is run on
jffs2 it would affect every layer and hard to be sure you had a control to
compare with.

Con