From owner-freebsd-questions@FreeBSD.ORG  Fri Aug 31 21:43:43 2007
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From: Chuck Swiger <cswiger@mac.com>
Date: Fri, 31 Aug 2007 14:43:37 -0700
To: deeptech71@gmail.com
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Cc: freebsd-questions@freebsd.org
Subject: Re: dummynet lag
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On Aug 31, 2007, at 6:34 AM, deeptech71@gmail.com wrote:
> Is it normal to have +10msec ping times when pinging through  
> dummynet (ipfw pipes)? If yes, why? If not, WTF?

If your HZ is 100, then, yes, it's common for the packets to be  
delayed by 10+ msec.  Set HZ to 1000 or higher and you'll have the  
latency drop to circa 1 ms.

-- 
-Chuck