From: Bill Hartner <hartner@austin.ibm.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [Lse-tech] Re: [PATCH] [PERFORMANCE RESULTS] priority preemption in Linux
Date: Wed, 16 Oct 2002 13:04:41 -0500 [thread overview]
Message-ID: <3DADAA38.EEB1927F@austin.ibm.com> (raw)
In-Reply-To: Pine.LNX.4.44.0210151926280.16262-100000@localhost.localdomain
Ingo Molnar wrote:
>
> On Tue, 15 Oct 2002, Bill Hartner wrote:
>
> > kernel preemption conforming percent
> > threshold connections improvement
> > ====== =========== =========== ===========
> >
> > 2.5.33 0 (default) 2906 baseline
> > 2.5.33 40 2990 2.9 %
> >
> > Table 3 shows that reducing priority preemption improved the
> > number of conforming connections by 2.9 %.
>
> actually, the more interesting metric is the ops/sec value - how did that
> change? Conforming connections is a cutoff value and the real improvement
> might be bigger than that.
The 2.5.33 baseline was 7952 ops/s and it improved to 8101 which is 1.9 %.
The SPECweb99 UP needs to be instrumented to see what the level of priority
preemption is. May not be a problem at all - the VolanoMark case had a group
of processes running at a higher priority and long run queues.
Bill
prev parent reply other threads:[~2002-10-16 18:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-10-15 15:50 [PATCH] [PERFORMANCE RESULTS] priority preemption in Linux Bill Hartner
2002-10-15 17:27 ` Ingo Molnar
2002-10-16 18:04 ` Bill Hartner [this message]
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