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Reject negative path delay. 

If the path delay comes out negative, then something is amiss. In this
case, we just print a warning and ignore the path delay estimate.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2011-12-13 05:30:45 +01:00
parent cecc20a307
commit ecf959ce3d
1 changed files with 11 additions and 0 deletions
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11
clock.c
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@ -350,6 +350,17 @@ void clock_path_delay(struct clock *c, struct timespec req, struct timestamp rx,
pd = tmv_sub(pd, tmv_add(c1, tmv_add(c2, c3)));
pd = tmv_div(pd, 2);
if (pd < 0) {
pr_debug("negative path delay %10lld", pd);
pr_debug("path_delay = (t2 - t3) + (t4 - t1)");
pr_debug("t2 - t3 = %+10lld", t2 - t3);
pr_debug("t4 - t1 = %+10lld", t4 - t1);
pr_debug("c1 %10lld", c1);
pr_debug("c2 %10lld", c2);
pr_debug("c3 %10lld", c3);
return;
}
c->path_delay = mave_accumulate(c->avg_delay, pd);
pr_debug("path delay %10lld %10lld", c->path_delay, pd);