Re: [PATCH] TX_RING and packet mmap

[full quote for linux-man, Michael]

On Tue, May 12, 2009 at 07:58:06PM +0200, Johann Baudy wrote:

Hi Andi,

Currently, There is nothing in the manpage of packet(7) about RX_RING.

Yes mmap was never documented. But if you could do that that would
be great.

However I can start to write a summary  that describes processes, headers
and statuses of both feature (RX_RING and TX_RING).
I think "Socket Options" section of packet(7) is appropriate.

Sounds good. Please send the result to linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

-Andi

Johann


On Tue, May 12, 2009 at 6:11 PM, Andi Kleen [off-list ref] wrote:

quoted

Johann Baudy [off-list ref] writes:

quoted

From: Johann Baudy <redacted>

New packet socket feature that makes packet socket more efficient for

transmission.

quoted

- It reduces number of system call through a PACKET_TX_RING mechanism,

based on PACKET_RX_RING (Circular buffer allocated in kernel space which is
mmapped from user space).

quoted

- It minimizes CPU copy using fragmented SKB (almost zero copy).

When you add new interfaces like this you should add them to the packet (7)
manpage too.

-Andi

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ak-VuQAYsv1563Yd54FQh9/CA@public.gmane.org -- Speaking for myself only.

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