In the last linux version, we disabled this feature to fix the regress[1]. The patch set is try to fix the problem and re-enable it.
More info: http://lore.kernel.org/all/[email protected] Thanks. [1]: http://lore.kernel.org/all/[email protected] Xuan Zhuo (5): virtio-net: fix overflow inside virtnet_rq_alloc virtio_net: introduce vi->mode virtio_net: big mode skip the unmap check virtio_net: enable premapped mode for merge and small by default virtio_net: rx remove premapped failover code drivers/net/virtio_net.c | 168 ++++++++++++++++++++++++--------------- 1 file changed, 105 insertions(+), 63 deletions(-) -- 2.32.0.3.g01195cf9f
