netdev - Re: [PATCH net v2] gso: Update tunnel segmentation to support Tx checksum offload

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Date:	Thu, 11 Jul 2013 02:23:31 +0000 (UTC)
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	netdev@...r.kernel.org
Subject: Re: [PATCH net v2] gso: Update tunnel segmentation to support Tx
 checksum offload

On Thu, 11 Jul 2013 at 00:42 GMT, Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Wed, 2013-07-10 at 17:05 -0700, Alexander Duyck wrote:
>> This change makes it so that the GRE and VXLAN tunnels can make use of Tx
>> checksum offload support provided by some drivers via the hw_enc_features.
>> Without this fix enabling GSO means sacrificing Tx checksum offload and
>> this actually leads to a performance regression as shown below:
>> 
>>             Utilization
>>             Send
>> Throughput  local         GSO
>> 10^6bits/s  % S           state
>>   6276.51   8.39          enabled
>>   7123.52   8.42          disabled
>
> While testing your patch, I discovered TSO support is completely broken
> on GRE, using bnx2x testbed.
>

In my test, GRE works fine, but gretap not.

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