netdev - Re: HTB accuracy on 10GbE

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Date:	Thu, 5 Nov 2009 19:15:30 +0900
From:	Ryousei Takano <ryousei@...il.com>
To:	Eric Dumazet <eric.dumazet@...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

Hi Eric,

On Thu, Nov 5, 2009 at 4:10 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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
>
I got it.
Thanks for your explanation.

Best regards,
Ryousei
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