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Date:	Thu, 24 May 2012 06:53:59 +0200
From:	Eric Dumazet <>
To:	Vijay Subramanian <>
Cc:, Stephen Hemminger <>,
	Dave Taht <>
Subject: Re: [PATCH IPROUTE2] tc-codel: Add manpage

On Wed, 2012-05-23 at 21:33 -0700, Vijay Subramanian wrote:
> This patch adds the manpage for the CoDel (Controlled-Delay) AQM.
> Signed-off-by: Vijay Subramanian <>
> ---

Thanks !

> +.SS target
> +is the acceptable minimum standing/persistent queue delay. This minimum delay
> +is identified by tracking the local minimum queue delay that packets experience.
> +Default and recommended value is 5ms.

Although I can tell I prefer lower values on hosts.

On 10Gbe links, I used 500us target

> +
> +.SS interval
> +is used to ensure that the measured minimum delay does not become too stale. The
> +minimum delay must be experienced in the last epoch of length
> +.B interval.
> +It should be set on the order of the worst-case RTT through the bottleneck to
> +give endpoints sufficient time to react.  Default value is 100ms.

Same here. In a datacenter, you might reduce this to 20ms or so...

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