On Mon, Mar 28, 2005 at 06:12:39PM +0200, Andi Kleen wrote:

So in short using mempools on receiving is not needed.

I think you are assuming that there's still some atomic memory available
sometime in the future to allocate the skb for the ack, this isn't
necessairly true.

I outlined an algo that thanks to proper mempool-like reservation and
random picking of all mempool registered on a single nic, will avoid the
deadlock for receive. The less mempools there are and the bigger they
are, the faster it will recover.