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

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Date:	Sat, 20 Oct 2012 09:26:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Vimalkumar <j.vimal@...il.com>, davem@...emloft.net,
	Jamal Hadi Salim <jhs@...atatu.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] htb: improved accuracy at high rates

On Fri, 2012-10-19 at 16:52 -0700, Rick Jones wrote:

> Did it really take 20 concurrent netperf UDP_STREAM tests to get to 
> those rates?  And why UDP_STREAM rather than TCP_STREAM?
> 
> I couldn't recall if GSO did anything for UDP, so did some quick and 
> dirty tests flipping GSO on and off on a 3.2.0 kernel, and the service 
> demands didn't seem to change.  So, with 8000 bytes of user payload did 
> HTB actually see 8000ish byte packets, or did it actually see a series 
> of <= MTU sized IP datagram fragmentsOn 10/19/2012 03:26 PM, Vimalkumar 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.


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