Hello,
Is it a known problem that the Netem qdisc is very unreliable on the
loopback (unlike on a true NIC)?
This seems to come from its usage of skb->cb which conflicts with IPCB.
For instance, the field
IPCB(skb)->opt.optlen becomes non-null and memory corruption follows.
I ``worked around'' this conflict with the following ugly hack:
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -79,6 +79,7 @@ struct netem_sched_data {
/* Time stamp put into socket buffer control block */
struct netem_skb_cb {
+ char padding[32]; /* to avoid stepping over IPCB when used on the
loopback */
psched_time_t time_to_send;
};
Hopefully someone has a better solution :-)
Thanks.
--
Guillaume
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