6.3. Enabling vhost-net zero-copy

download PDF
In Red Hat Enterprise Linux 7, vhost-net zero-copy is disabled by default. To enable this action on a permanent basis, add a new file vhost-net.conf to /etc/modprobe.d with the following content:
options vhost_net  experimental_zcopytx=1
If you want to disable this again, you can run the following:
modprobe -r vhost_net
modprobe vhost_net experimental_zcopytx=0
The first command removes the old file, the second one makes a new file (like above) and disables zero-copy. You can use this to enable as well but the change will not be permanent.
To confirm that this has taken effect, check the output of cat /sys/module/vhost_net/parameters/experimental_zcopytx. It should show:
$ cat /sys/module/vhost_net/parameters/experimental_zcopytx
Red Hat logoGithubRedditYoutubeTwitter


Try, buy, & sell


About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.