Re: [PATCH net-next] udp: under rx pressure, try to condense skbs

On 12/08/2016 07:30 AM, Eric Dumazet wrote:

On Thu, 2016-12-08 at 10:46 +0100, Jesper Dangaard Brouer wrote:

quoted

Hmmm... I'm not thrilled to have such heuristics, that change memory
behavior when half of the queue size (sk->sk_rcvbuf) is reached.

Well, copybreak drivers do that unconditionally, even under no stress at
all, you really should complain then.

Isn't that behaviour based (in part?) on the observation/belief that it 
is fewer cycles to copy the small packet into a small buffer than to 
send the larger buffer up the stack and have to allocate and map a 
replacement?

rick jones