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Date:      Sat, 10 Nov 2007 21:14:44 +0100
From:      Kris Kennaway <kris@FreeBSD.org>
To:        josh.carroll@gmail.com
Cc:        Jeff Roberson <jroberson@chesapeake.net>, freebsd-performance@freebsd.org
Subject:   Re: ULE vs. 4BSD in RELENG_7
Message-ID:  <47361134.3050301@FreeBSD.org>
In-Reply-To: <8cb6106e0711101158o16887999rf7f7302ad44d0de8@mail.gmail.com>
References:  <8cb6106e0710230902x4edf2c8eu2d912d5de1f5d4a2@mail.gmail.com>	<8cb6106e0711032221i2ecf1d59ge82f368d4162a827@mail.gmail.com>	<20071104122546.S544@10.0.0.1>	<8cb6106e0711041243s37ef92e3i9c5c79827f547dbb@mail.gmail.com>	<20071104151722.M544@10.0.0.1>	<8cb6106e0711050141g674a7733h53f7e6a20e75ad07@mail.gmail.com>	<20071106171059.M544@10.0.0.1>	<8cb6106e0711062136r18ca8e67sbdb4d4372e10e086@mail.gmail.com>	<20071109145827.W639@10.0.0.1>	<8cb6106e0711091855x1305ee2bt6d57696df7c7564@mail.gmail.com> <8cb6106e0711101158o16887999rf7f7302ad44d0de8@mail.gmail.com>

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Josh Carroll wrote:
>> ffmpeg:  1:38.885
>>
>> sysbench: (4,8,12,16 threads respectively):
>>    2221.93
>>    2327.87
>>    2292.49
>>    2269.29
>>
>> And buildworld: 13m47.052s
> 
> I ran these after changing the slice value to 7 as well with this patch.
> 
> ffmpeg:  1:38.547

BTW, it doesn't make much sense to be measuring to millisecond precision 
a quantity which has variation that is unknown but probably much larger 
:)  When trying to make comparisons to identify performance changes, a 
careful statistical approach is necessary.

Try the /usr/src/tools/tools/ministat utility for a simple and effective 
way to compare these kinds of noisy measurements and extract reliable 
comparisons.

Kris



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