Re: FreeBSD box as router adding latency

From: Chris Dillon (cdillon_at_wolves.k12.mo.us)
Date: 02/26/04

  • Next message: Mike Wade: "Persistant random receiving packet drops with wi(4) and IBSS" 
    Date: Thu, 26 Feb 2004 16:02:46 -0600 (CST)
To: Aloha Guy <alohaguy123@yahoo.com>

    On Thu, 26 Feb 2004, Aloha Guy wrote:

    > > What do you have HZ set to (see sysctl kern.clockrate)? I think I
    > > remember your original message showing you using pipes and queues
    > > and the HZ setting can affect those. Also see if your latency
    > > improves if you remove all pipe and queue rules (other ipfw rules
    > > are OK).
    >
    >
    > Here is the HZ setting:
    >
    > kern.clockrate: { hz = 100, tick = 10000, profhz = 1024, stathz = 128 }
    >
    > I'm not sure how to remove the pipe since I don't think the pipe
    > works until the queue is defined. When I removed the queues that
    > are configured for the pipe, the latency is back to normal though.

    Like I said, remove both pipes and queues to test. However, pipes
    _can_ be used without queues, but that is irrelevant here. Try
    setting HZ to 1000 in your kernel config, recompile, reboot, and test
    again. You should see something between a slight improvement to a
    ten-fold improvement. 

    -- 
 Chris Dillon - cdillon(at)wolves.k12.mo.us
 FreeBSD: The fastest, most open, and most stable OS on the planet
 - Available for IA32, IA64, AMD64, PC98, Alpha, and UltraSPARC architectures
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Q: Because it reverses the logical flow of conversation.
A: Why is putting a reply at the top of the message frowned upon?
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  • Next message: Mike Wade: "Persistant random receiving packet drops with wi(4) and IBSS"

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