Re: 2.4.8-pre1 and dbench -20% throughput

From: Marcelo Tosatti (
Date: Mon Jul 30 2001 - 08:15:48 EST

On Sat, 28 Jul 2001, Daniel Phillips wrote:

> On Saturday 28 July 2001 02:35, Steven Cole wrote:
> > I also saw a significant drop in dbench 32 results.
> > Here are a few more data points, this time comparing 2.4.8-pre1 with
> > 2.4.7.
> >
> > 2.4.7 9.3422 MB/sec vs 2.4.8-pre1 6.88884 MB/sec average of 3
> > runs
> >
> > The system under test has 384 MB of memory, and did not go
> > into swap during the test. I performed a set of three runs
> > immediately after a boot, and with no pauses in between individual
> > runs. I used time ./dbench 32 and caputured the output in a file
> > using script `uname -r`. The tests were done with X and KDE running,
> > but no other activity.
> The variation is accounted for almost entirely by the change in system
> time. Does this mean more IO's or more scanning? I don't know, more
> research needed.
> We need Marcelo's vm statistics patch, I wonder what the status of that
> is.

Well, I've switched to Andrew Morton's generic stats scheme.

I've also started writing a new userlevel tool (based on cpustat.c from
Zach Brown) to "replace" the old vmstat.c.

Right now I'm busy fixing clients problems and kernel RPM bugs, but I hope
to have the new vm stats patch using Andrew's scheme plus the userlevel
tool until the end of the week.

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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:44 EST