perfSONAR User Q&A and Other Discussion

[Ben Nelson <>]

Hi All,

I'm wondering if anyone has run into this issue before.  All the owamp
tests to/from one of our hosts for ~30 minutes started showing large
amounts of loss, and as the event began winding down, we were seeing
very high latency on the order of 9.8-9.9 seconds.  It doesn't appear to
be a network issue from what we could tell.

Additionally, the owamp debug logs reported these, which I hadn't seen
before:

2014-05-15T18:30:19+00:00|local5|debug|powstream|powstream[5196]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:20+00:00|local5|debug|powstream|powstream[5165]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:20+00:00|local5|debug|powstream|powstream[5524]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:21+00:00|local5|debug|powstream|powstream[5324]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:21+00:00|local5|debug|powstream|powstream[5382]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:21+00:00|local5|debug|powstream|powstream[5273]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:22+00:00|local5|debug|powstream|powstream[5387]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.
2014-05-15T18:30:23+00:00|local5|debug|powstream|powstream[5153]:
alloc_node: Pre-alloc buffer too small. Allocating additional nodes for
lost-packet-buffer.

They occurred fairly frequently during the same period we experienced
the loss.

Anyone have any thoughts?

Thanks,
Ben

-- 
Ben Nelson, Systems Engineer
Indiana University GlobalNOC
<>