Ah. You are receiver livelocked. Try enabling polling; it will help up to the first stall barrier (NETISR not getting a chance to run protocol processing to completion because of interrupt overhead); there are two other stall barriers after that, and another in user space is possible depending on whether the application layer is request/response.
Are you sure that polling would help even since the em driver is using interrupt regulation by default? It might solve the livelock but it does probably not increase the performance of the mbuf allocator?
Pete
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