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Date: Fri, 16 Jun 2006 14:13:00 -0500
To: Darrin Chandler <dwchandler@stilyagin.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: pf + ftp throughput
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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