On Tue, 2015-08-11 at 18:13 -0700, Alexei Starovoitov wrote:
> Also why introduce the flag? Why not just add 'tx_queue_len = 0;'
> to veth_setup() like the whole bunch of devices do?
Sigh.
Because some people install htb or pfifo on veth, leaving tx_queue_len
unchanged.
If you install htb while tx_queue_len is 0, pfifo created on htb classe
can only queue one packet.
static int fifo_init(struct Qdisc *sch, struct nlattr *opt)
{
bool bypass;
bool is_bfifo = sch->ops == &bfifo_qdisc_ops;
if (opt == NULL) {
u32 limit = qdisc_dev(sch)->tx_queue_len ? : 1;
if (is_bfifo)
limit *= psched_mtu(qdisc_dev(sch));
sch->limit = limit;
Changing veth txqueuelen is too late.
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