From b03c6f99c69fab600af6103b37570170aa70e42a Mon Sep 17 00:00:00 2001 From: Ethan Jackson Date: Tue, 19 Jun 2012 13:24:43 -0700 Subject: [PATCH] cfm: Warn when delayed sending CCMs. We've recently seen problems where OVS can get delayed sending CCM probes by several seconds. This can cause tunnels to flap, and generally wreak havoc. It's easy to detect when this is happening, so minimally, warning should be helpful to those debugging problems. Signed-off-by: Ethan Jackson --- lib/cfm.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/lib/cfm.c b/lib/cfm.c index 98595259..357baf07 100644 --- a/lib/cfm.c +++ b/lib/cfm.c @@ -118,7 +118,7 @@ struct cfm { received. */ int health_interval; /* Number of fault_intervals since health was recomputed. */ - + long long int last_tx; /* Last CCM transmission time. */ }; /* Remote MPs represent foreign network entities that are configured to have @@ -299,6 +299,7 @@ cfm_create(const char *name) cfm->remote_opup = true; cfm->fault_override = -1; cfm->health = -1; + cfm->last_tx = 0; return cfm; } @@ -466,6 +467,16 @@ cfm_compose_ccm(struct cfm *cfm, struct ofpbuf *packet, if (hmap_is_empty(&cfm->remote_mps)) { ccm->flags |= CCM_RDI_MASK; } + + if (cfm->last_tx) { + long long int delay = time_msec() - cfm->last_tx; + if (delay > (cfm->ccm_interval_ms * 3 / 2)) { + VLOG_WARN("%s: long delay of %lldms (expected %dms) sending CCM" + " seq %"PRIu32, cfm->name, delay, cfm->ccm_interval_ms, + cfm->seq); + } + } + cfm->last_tx = time_msec(); } void -- 2.30.2