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authorJason Wang <jasowang@redhat.com>2017-11-13 11:45:34 +0800
committerDavid S. Miller <davem@davemloft.net>2017-11-15 13:50:58 +0900
commitfeb8892cb441c742d4220cf7ced001e7fa070731 (patch)
tree5e0b6f1b25d54e6bb4c57bf0ade726a01c330fbe /drivers/vhost
parent0eef304bc9f7d079a1165e8cd2f24b078e9e1f2a (diff)
downloadlinux-feb8892cb441c742d4220cf7ced001e7fa070731.tar.bz2
vhost_net: conditionally enable tx polling
We always poll tx for socket, this is sub optimal since this will slightly increase the waitqueue traversing time and more important, vhost could not benefit from commit 9e641bdcfa4e ("net-tun: restructure tun_do_read for better sleep/wakeup efficiency") even if we've stopped rx polling during handle_rx(), tx poll were still left in the waitqueue. Pktgen from a remote host to VM over mlx4 on two 2.00GHz Xeon E5-2650 shows 11.7% improvements on rx PPS. (from 1.28Mpps to 1.44Mpps) Cc: Wei Xu <wexu@redhat.com> Cc: Matthew Rosato <mjrosato@linux.vnet.ibm.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/net.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 68677d930e20..8d626d7c2e7e 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -471,6 +471,7 @@ static void handle_tx(struct vhost_net *net)
goto out;
vhost_disable_notify(&net->dev, vq);
+ vhost_net_disable_vq(net, vq);
hdr_size = nvq->vhost_hlen;
zcopy = nvq->ubufs;
@@ -556,6 +557,7 @@ static void handle_tx(struct vhost_net *net)
% UIO_MAXIOV;
}
vhost_discard_vq_desc(vq, 1);
+ vhost_net_enable_vq(net, vq);
break;
}
if (err != len)