netdev - Re: HTB accuracy on 10GbE

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Date:	Thu, 05 Nov 2009 08:10:00 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ryousei Takano <ryousei@...il.com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	Patrick McHardy <kaber@...sh.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	takano-ryousei@...t.go.jp
Subject: Re: HTB accuracy on 10GbE

Ryousei Takano a écrit :
> In my experiment, it is not very big problem.  I do not send short packets.
> I got the almost same result in the both cases "mtu 64000" and "mtu
> 40000 quantum 60000".
> 
> Anyway, setting larger mtu size than the physical mtu does not quiet make sense.
> 

tc class mtu is a hint given to stack, about average packet size, ie not
related to physical MTU (because of TSO)

You could use same mtu, but disable tso on device
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