[Oisf-users] EXTERNAL: Re: autofp vs workers - updated comparison?

[Cooper F. Nelson]

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Details are in Documentation/networking/packet_mmap.txt

> In the AF_PACKET fanout mode, packet reception can be load balanced among
> processes. This also works in combination with mmap(2) on packet sockets.
> 
> Currently implemented fanout policies are:
> 
>   - PACKET_FANOUT_HASH: schedule to socket by skb's packet hash
>   - PACKET_FANOUT_LB: schedule to socket by round-robin
>   - PACKET_FANOUT_CPU: schedule to socket by CPU packet arrives on
>   - PACKET_FANOUT_RND: schedule to socket by random selection
>   - PACKET_FANOUT_ROLLOVER: if one socket is full, rollover to another
>   - PACKET_FANOUT_QM: schedule to socket by skbs recorded queue_mapping

- From what I can tell, if a packet socket is full you will still drop
packets from the last flow that was pinned to that socket.  However, new
flows will not be assigned to that socket, rather they are "rolled over"
to another socket.

- -Coop

On 7/21/2015 3:25 PM, Rasmor, Zachary R wrote:
> Hello Eric,
> 
> Thanks for the reply, this definitely sounds interesting. One
> question...My understanding was that it is necessary for all packets
> belonging to a given flow to be processed by the same worker thread.
> Am I mistaken? And if my understanding is correct, how does this work
> with the rollover option when a packet is sent to a different
> socket?
> 
> Regards, Zach


- -- 
Cooper Nelson
Network Security Analyst
UCSD ACT Security Team
cnelson at ucsd.edu x41042
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