On Tue, 2013-11-19 at 23:53 +0200, Michael S. Tsirkin wrote: > Which NIC? Virtio? Prior to 2613af0ed18a11d5c566a81f9a6510b73180660a > it didn't drop packets received from host as far as I can tell. > virtio is more like a pipe than a real NIC in this respect.
Prior/after to this patch, you were not posting buffers, so if packets were received on a physical NIC, you were dropping the packets anyway. It makes no difference at all, adding a cushion might make you feel better, but its really not worth it. Under memory stress, it makes better sense to drop a super big GRO packet (The one needing frag_list extension ...) It gives a better signal to the sender to reduce its pressure, and gives opportunity to free more of your memory. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
