Jason Wang e4dab1e6ea 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>

2018-11-17 12:00:42 -08:00

..

Kconfig

vhost: allow vhost-scsi driver to be built-in

2018-08-22 01:01:32 +03:00

Kconfig.vringh

vhost: split out vringh Kconfig

2016-08-02 16:54:28 +03:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

net.c

vhost_net: mitigate page reference counting during page frag refill

2018-11-17 12:00:42 -08:00

scsi.c

vhost/scsi: Use common handling code in request queue handler

2018-10-24 21:16:13 -04:00

test.c

treewide: kmalloc() -> kmalloc_array()

2018-06-12 16:19:22 -07:00

test.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

vhost.c

vhost: Fix Spectre V1 vulnerability

2018-10-31 12:39:15 -07:00

vhost.h

vhost: switch to use new message format

2018-08-06 10:41:04 -07:00

vringh.c

treewide: kmalloc() -> kmalloc_array()

2018-06-12 16:19:22 -07:00

vsock.c

fw_cfg, vhost: features fixes

2018-04-06 19:21:41 -07:00