Subject: Re: [PATCH net-next 3/3] net: allow to leave the buffer fragmented in skb_cow_data()

From: Mathias Krause <[email-masked]>
Date: Tue, 05 Nov 2013 15:43:10 +0100

On 05.11.2013 15:33, Eric Dumazet wrote:
> On Tue, 2013-11-05 at 14:54 +0100, Mathias Krause wrote:
>> Do not linearize the buffer per se but only if we're expected to expand
>> the tail. All callers can handle fragmented buffers and even expect
>> them!
>>
>> Not linearizing the buffer leads to a small performance improvement for
>> the IPsec receive path in case the network driver passed us a fragmented
>> buffer.
>>
>> With this patch applied I was able to increase the throughput of an
>> IPsec gateway from 7.12 Gbit/s to 7.28 Gbit/s.
> 
> What is the driver you used ?

The device driver is ixgbe driving an Intel X520-T2. Why you're asking?