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Jason Wang f5755c0e87 vhost_net: correctly check tx avail during rx busy polling ... [ Upstream commit 8b949bef91 ] We check tx avail through vhost_enable_notify() in the past which is wrong since it only checks whether or not guest has filled more available buffer since last avail idx synchronization which was just done by vhost_vq_avail_empty() before. What we really want is checking pending buffers in the avail ring. Fix this by calling vhost_vq_avail_empty() instead. This issue could be noticed by doing netperf TCP_RR benchmark as client from guest (but not host). With this fix, TCP_RR from guest to localhost restores from 1375.91 trans per sec to 55235.28 trans per sec on my laptop (Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz). Fixes: 0308813724 ("vhost_net: basic polling support") Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2017-09-20 08:19:56 +02:00
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Kconfig	vhost: split out vringh Kconfig	2016-08-02 16:54:28 +03:00
Kconfig.vringh	vhost: split out vringh Kconfig	2016-08-02 16:54:28 +03:00
Makefile	VSOCK: Add Makefile and Kconfig	2016-08-02 02:57:30 +03:00
net.c	vhost_net: correctly check tx avail during rx busy polling	2017-09-20 08:19:56 +02:00
scsi.c	vhost/scsi: fix reuse of &vq->iov[out] in response	2016-08-23 17:16:57 +03:00
test.c	Merge 4.8-rc5 into char-misc-next	2016-09-05 08:04:07 +02:00
test.h	vhost test module	2010-12-09 16:00:21 +02:00
vhost.c	vhost: fix initialization for vq->is_le	2017-02-09 08:08:28 +01:00
vhost.h	vhost: new device IOTLB API	2016-08-02 16:53:54 +03:00
vringh.c	vringh: update for virtio 1.0 APIs	2014-12-15 23:49:28 +02:00
vsock.c	vhost/vsock: handle vhost_vq_init_access() error	2017-06-17 06:41:57 +02:00