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authorJason Wang <jasowang@redhat.com>2018-11-15 12:43:09 +0300
committerDavid S. Miller <davem@davemloft.net>2018-11-17 23:00:42 +0300
commite4dab1e6ea64376ebd3b59281ecaaeb788116be3 (patch)
tree2f1e7d1b6ff105cec5ebcf0f1808ff7da72f9543 /Makefile
parentb8b9618a4f6a6660cb1ff44dd401a4b21f2caf6c (diff)
downloadlinux-e4dab1e6ea64376ebd3b59281ecaaeb788116be3.tar.xz
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>
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