session: increase retries to  grab mq lock
With thousands of UDP sessions,
Sometimes VPP needs more time to grab the MQ lock for a session.
So increased tries from 5 to 75.
Type: fix
@@ -683,7 +683,7 @@ mq_try_lock_and_alloc_msg (svm_msg_q_t *mq, session_mq_rings_e ring,
{
int rv, n_try = 0;
- while (n_try < 5)
+ while (n_try < 75)
{
rv = svm_msg_q_lock_and_alloc_msg_w_ring (mq, ring, SVM_Q_NOWAIT, msg);
if (!rv)
