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Date:      Mon, 08 Oct 2001 08:20:37 -0500
From:      Eric Anderson <anderson@centtech.com>
To:        Danny Braniss <danny@cs.huji.ac.il>
Cc:        freebsd-hackers@freebsd.org, stable@freebsd.org
Subject:   Re: strange network performace
Message-ID:  <3BC1A825.A1839C6C@centtech.com>
References:  <E15qaIC-0000AN-00@pampa.cs.huji.ac.il>

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How many times did you run the test?  Could it have been cached in host B, but not C?  What about disk performance? 
Maybe one is ATA66 or 100, and tthe other is not?  Host C may only be UDMA33, and possibly have a slow drive, with a
lower amount of memory for caching.  Did you rebuild kernels on any of them?

Eric



Danny Braniss wrote:
> 
> setup:
>         host A: dual pentium III/1GHz (Dell 2450)
>         host B: dual pentium III/950MHz (Intel STL2)
>         host C: Pentium III/1GHz (Dell GX150)
> 
>         all connected at 100Mgb full duplex
>         all three are running FreeBSD 4.4.
> 
> all three have identical troughput when writing to a NetAPP fileserver ~ 10MBs
> 
> but:
>         B -> A: ~ 6MBs
>         C -> A: ~ 2MBs
> 
> Q: why is C -> A so bad?
> 
> danny
> 
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Eric Anderson	 anderson@centtech.com    Centaur Technology
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