* zero copy with PACKET_MMAP
@ 2014-02-27 6:40 ratheesh kannoth
2014-02-27 9:58 ` Daniel Borkmann
0 siblings, 1 reply; 2+ messages in thread
From: ratheesh kannoth @ 2014-02-27 6:40 UTC (permalink / raw)
To: netdev, linux-net
Hi ,
The link
https://www.kernel.org/doc/Documentation/networking/packet_mmap.txt
talks about achieving zero copy. But i find a deep packet copy ( of
length snaplen= skb->len ) here
http://lxr.free-electrons.com/source/net/packet/af_packet.c#L1841.
Is there anything missing/wrong in my understanding ?
Thanks,
Ratheesh
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: zero copy with PACKET_MMAP
2014-02-27 6:40 zero copy with PACKET_MMAP ratheesh kannoth
@ 2014-02-27 9:58 ` Daniel Borkmann
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Borkmann @ 2014-02-27 9:58 UTC (permalink / raw)
To: ratheesh kannoth; +Cc: netdev, linux-net
On 02/27/2014 07:40 AM, ratheesh kannoth wrote:
...
> https://www.kernel.org/doc/Documentation/networking/packet_mmap.txt
> talks about achieving zero copy. But i find a deep packet copy ( of
> length snaplen= skb->len ) here
> http://lxr.free-electrons.com/source/net/packet/af_packet.c#L1841.
>
> Is there anything missing/wrong in my understanding ?
The zero-copy is between user and kernel space.
^ permalink raw reply [flat|nested] 2+ messages in thread
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