slirp4netns: set mtu to 65520
it improves significantly the performance of the slirp4netns network:
Closes:
@@ -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{
