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Date:      Fri, 16 Jun 2006 14:13:00 -0500
From:      "J.D. Bronson" <jbronson@wixb.com>
To:        Darrin Chandler <dwchandler@stilyagin.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: pf + ftp throughput
Message-ID:  <7.0.1.0.2.20060616141226.00e743b0@sixcompanies.com>
In-Reply-To: <20060616191028.GB9804@jeeves.stilyagin.local>
References:  <7.0.1.0.2.20060616135513.00e743b0@sixcompanies.com> <20060616191028.GB9804@jeeves.stilyagin.local>

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At 02:10 PM 6/16/2006, Darrin Chandler wrote:
>On Fri, Jun 16, 2006 at 01:59:01PM -0500, J.D. Bronson wrote:
> > For example...moving a 50MB file:
> >
> > 'keep state' = 11-12MB/sec over 100MB-FDX
> > 'modulate state = 6-7MB/sec over 100MB-FDX
> >
> > ..it took me a while to determine the culprit here - but I am curious
> > as to why this is the case?
>
>Since modulate state substitues its own high quality random sequence for
>the TCP stream in both directions, a wimpy CPU or similar problem could
>easily cause this, I think. Still, I'm surprised to see a 50% hit from
>using modulate state.

Yes. I am too!
This is a P4-3.06 with 1GB ram...under almost no load...so I cant 
fault the CPU this time....

-JD 




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