tree 2f1e7d1b6ff105cec5ebcf0f1808ff7da72f9543
parent b8b9618a4f6a6660cb1ff44dd401a4b21f2caf6c
author Jason Wang <jasowang@redhat.com> 1542274989 +0800
committer David S. Miller <davem@davemloft.net> 1542484842 -0800

vhost_net: mitigate page reference counting during page frag refill

We do a get_page() which involves a atomic operation. This patch tries
to mitigate a per packet atomic operation by maintaining a reference
bias which is initially USHRT_MAX. Each time a page is got, instead of
calling get_page() we decrease the bias and when we find it's time to
use a new page we will decrease the bias at one time through
__page_cache_drain_cache().

Testpmd(virtio_user + vhost_net) + XDP_DROP on TAP shows about 1.6%
improvement.

Before: 4.63Mpps
After:  4.71Mpps

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>