Archipelago » qemu

/* sndbuf should be set to a value lower than the tx queue

 * capacity of any destination network interface.

 * Ethernet NICs generally have txqueuelen=1000, so 1Mb is

 * a good default, given a 1500 byte MTU.

 */

#define TAP_DEFAULT_SNDBUF 1024*1024

int tap_set_sndbuf(int fd, QemuOpts *opts)

{

    int sndbuf;

    sndbuf = qemu_opt_get_size(opts, "sndbuf", TAP_DEFAULT_SNDBUF);

    if (!sndbuf) {

        sndbuf = INT_MAX;

    }

    if (ioctl(fd, TUNSETSNDBUF, &sndbuf) == -1 && qemu_opt_get(opts, "sndbuf")) {

        qemu_error("TUNSETSNDBUF ioctl failed: %s\n", strerror(errno));

        return -1;

    }

    return 0;

}