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Date:      Wed, 29 Aug 2001 17:22:00 -0700
From:      "Kory Hamzeh" <kory@avatar.com>
To:        "Trevin Chow" <trevin@mail.com>, <questions@FreeBSD.ORG>
Subject:   RE: Performance tuning results
Message-ID:  <00c301c130e9$c96f1ca0$14ce21c7@avatar.com>
In-Reply-To: <BCCBC5E8BA377141B125D2C5F91ABA5B032C3EEB@red-msg-07.redmond.corp.microsoft.com>

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OK, I did some benchmarks and things did not come out like I thought they
should. Maybe some input from more experience FBSD users might explain
things.

The Test System: 800 MHZ P3, 256MB Ram, 30GIG UDMA/100 EIDE Drive running
4.3 RELEASE.

The Benchmark: I have a shell script that converts about 650 JPG files with
an average size of 30K to JPG thumbnails with an average size of 8K. I
rebooted the system before each test and entered the exact same commands. I
used the "time" command and just recorded the total elapsed time.

Results:

IDE write caching off, softupdates off: 	51.97 secs
IDE Write caching on,  softupdates off: 	47.39 secs
IDE Write caching off, softupdates on: 	50.46 secs
IDE Write caching on,  softupdates on: 	47.32 secs

What's interesting is that IDE write caching helped more than the
softupdates.

Kory





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