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Code Issues Releases Wiki Activity

vhost_net: disable zerocopy by default

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[ Upstream commit 098eadce3c ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jason Wang 2019-06-17 05:20:54 -04:00 committed by Greg Kroah-Hartman
parent 0ee3341eb3
commit e2c2891981
1 changed files with 1 additions and 1 deletions
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2
drivers/vhost/net.c
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@ -30,7 +30,7 @@
#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");