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slirp4netns: set mtu to 65520

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it improves significantly the performance of the slirp4netns network:

777bdcccef (iperf3-netns---host)

Closes: https://github.com/containers/libpod/issues/1732

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano
2019-03-13 13:59:16 +01:00
parent 7426d4fbbe
commit ac37fc149e
1 changed files with 2 additions and 2 deletions
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4
libpod/networking_linux.go
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@ -162,9 +162,9 @@ func (r *Runtime) setupRootlessNetNS(ctr *Container) (err error) {
var cmd *exec.Cmd
if havePortMapping {
// if we need ports to be mapped from the host, create a API socket to use for communicating with slirp4netns.
cmd = exec.Command(path, "-c", "-e", "3", "-r", "4", "--api-socket", apiSocket, fmt.Sprintf("%d", ctr.state.PID), "tap0")
cmd = exec.Command(path, "--mtu", "65520", "-c", "-e", "3", "-r", "4", "--api-socket", apiSocket, fmt.Sprintf("%d", ctr.state.PID), "tap0")
} else {
cmd = exec.Command(path, "-c", "-e", "3", "-r", "4", fmt.Sprintf("%d", ctr.state.PID), "tap0")
cmd = exec.Command(path, "--mtu", "65520", "-c", "-e", "3", "-r", "4", fmt.Sprintf("%d", ctr.state.PID), "tap0")
}
cmd.SysProcAttr = &syscall.SysProcAttr{