netdev - Re: [PATCH] htb: improved accuracy at high rates

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Message-ID: <CAK3Ji110q2UDbwzYpcSaBW7AQ3t=Ts+v+bo8-n3VhzV7NBmTQw@mail.gmail.com>
Date:	Sat, 20 Oct 2012 09:41:35 -0700
From:	Vimal <j.vimal@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Rick Jones <rick.jones2@...com>, davem@...emloft.net,
	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] htb: improved accuracy at high rates

On 20 October 2012 00:26, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> UFO is quite a virtual feature for the moment ;)
>
> To my knowledge only one driver uses it (neterion/s2io.c)
>
> So most probably HTB sees the fragments built by the stack before
> queueing packets to the qdisc layer.
>
> tcpdump can be used to check this.


Ah you're right.  When I checked tcpdump output earlier, I checked the
IP length which was 8000 bytes, so I presumed UFO was on.  When I
looked carefully again, the bytes on the wire were MTU sized.

Thanks for the suggestions!  I just sent the next version of the patch
against net-next, and provided a simpler example that illustrates the
inaccuracy.

-- 
Vimal
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