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authorJason Wang <jasowang@redhat.com>2019-06-17 12:20:54 +0300
committerDavid S. Miller <davem@davemloft.net>2019-06-17 23:58:02 +0300
commit098eadce3c622c07b328d0a43dda379b38cf7c5e (patch)
tree1c4aa5aa646d416495599bb04bf514eceee61f4b /drivers/vhost/net.c
parentc681edae33e86ff27be2d6cc717663d91df20b0e (diff)
downloadlinux-098eadce3c622c07b328d0a43dda379b38cf7c5e.tar.xz
vhost_net: disable zerocopy by default
Vhost_net was known to suffer from HOL[1] issues which is not easy to fix. Several downstream disable the feature by default. What's more, the datapath was split and datacopy path got the support of batching and XDP support recently which makes it faster than zerocopy part for small packets transmission. It looks to me that disable zerocopy by default is more appropriate. It cold be enabled by default again in the future if we fix the above issues. [1] https://patchwork.kernel.org/patch/3787671/ Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/vhost/net.c')
-rw-r--r--drivers/vhost/net.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index 2d9df786a9d3..21e0805e5e60 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -36,7 +36,7 @@
#include "vhost.h"
-static int experimental_zcopytx = 1;
+static int experimental_zcopytx = 0;
module_param(experimental_zcopytx, int, 0444);
MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
" 1 -Enable; 0 - Disable");