Date: Tue, 26 Feb 2002 14:40:55 -0500 From: Garance A Drosihn <drosih@rpi.edu> To: Bob Van Valzah <Bob@Talarian.Com>, smp@FreeBSD.ORG Subject: Re: Performance vs. Stable Message-ID: <p05101403b8a193a7e251@[128.113.24.47]> In-Reply-To: <1014749196.231.48.camel@NewStorm.WhiteBarn.Com> References: <1014749196.231.48.camel@NewStorm.WhiteBarn.Com>
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At 12:46 PM -0600 2/26/02, Bob Van Valzah wrote:
>I have run lmbench on 4.5-STABLE and 5.0-CURRENT (as of late
>last week). I believe this might give some insight into the
>relative performance of these kernels on uniprocessor micro
>benchmarks.
The first thing you need to include with any kind of benchmark
is the kernel settings you are running with. I'm not saying
that you have anything set wrong, but it is important to list
the settings just so everyone is aware that the settings make
a big difference on performance.
In particular, the settings for:
INVARIANTS
INVARIANT_SUPPORT
WITNESS
WITNESS_SKIPSPIN
in both systems. There's also the question of malloc options,
which I must admit I don't quite understand how the settings
are different between -stable and -release, or how to change
them. But they do effect almost any kind of serious benchmark
attempts.
--
Garance Alistair Drosehn = gad@eclipse.acs.rpi.edu
Senior Systems Programmer or gad@freebsd.org
Rensselaer Polytechnic Institute or drosih@rpi.edu
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