netdev - Re: [PATCH v2 2/2] net: netem: always adjust now/delay when not reordering

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Date:	Tue, 20 Aug 2013 23:14:07 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ferry Huberts <mailings@...ie.com>
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/2] net: netem: always adjust now/delay when not
 reordering

On Wed, 2013-08-21 at 07:59 +0200, Ferry Huberts wrote:
> From: Ferry Huberts <ferry.huberts@...agic.nl>
> 
> Not doing this (current behaviour) introduces reordering.
> 
> The packet_len_2_sched_time call is the only thing that logically
> depends on q->rate, so move the now/delay adjustment out of the if.
> 
> How to test:
> -----------

I ask again :

Did you test a config with both rate limiting and delay.

Netem primary use is to emulate say a 1Mbits link with a rtt of 50ms

netem rate 1Mbit delay 50ms


Because the "delay 10ms 500ms" is very strange : effective delay is in
the following range : -490 ms ... 510 ms

Its probably clamped to 0ms ... 510ms

I really doubt this is what you wanted.



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