netdev - Re: inaccurate packet scheduling

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Message-ID: <20121218184036.GB1690@minipsycho.orion>
Date:	Tue, 18 Dec 2012 19:40:36 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	Stephen Hemminger <stephen.hemminger@...tta.com>, jhs@...atatu.com,
	davem@...emloft.net, tgraf@...g.ch, netdev@...r.kernel.org
Subject: Re: inaccurate packet scheduling

Tue, Dec 18, 2012 at 07:06:53PM CET, edumazet@...gle.com wrote:
>> No such messages in log
>>
>>>Also turn off TSO since it screws up any form of rate control.
>>
>> Turning off TSO did not help. However, turning off scatter-gather
>> helped, on both HP DL360G8 (igb) and IBM JS22 (ehea).
>>
>
>Think to also disable GSO

On rhel6 kernel (2.6.32-based) I have to disable GSO as well.

The question is: Is this a bug or is it mandatory to get this offload
disabled in order to TBF to be working correctly?

Thanks a bunch.

Jiri

>
>Alternatively, you can use "mtu 65536" to allow TBF to send packets
>bigger than 2048 bytes
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