From: Jason Wang <jasowang@xxxxxxxxxx> Date: Thu, 15 Nov 2018 17:43:09 +0800 > 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@xxxxxxxxxx> Applied.
